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SACdeTERRE committed Mar 23, 2019
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Contributing to mqx Core
============================

The mqx Core project operates an open contributor model where anyone is
welcome to contribute towards development in the form of peer review, testing
and patches. This document explains the practical process and guidelines for
contributing.

Firstly in terms of structure, there is no particular concept of "Core
developers" in the sense of privileged people. Open source often naturally
revolves around meritocracy where longer term contributors gain more trust from
the developer community. However, some hierarchy is necessary for practical
purposes. As such there are repository "maintainers" who are responsible for
merging pull requests as well as a "lead maintainer" who is responsible for the
release cycle, overall merging, moderation and appointment of maintainers.


Contributor Workflow
--------------------

The codebase is maintained using the "contributor workflow" where everyone
without exception contributes patch proposals using "pull requests". This
facilitates social contribution, easy testing and peer review.

To contribute a patch, the workflow is as follows:

- Fork repository
- Create topic branch
- Commit patches

The project coding conventions in the [developer notes](doc/developer-notes.md)
must be adhered to.

In general [commits should be atomic](https://en.wikipedia.org/wiki/Atomic_commit#Atomic_commit_convention)
and diffs should be easy to read. For this reason do not mix any formatting
fixes or code moves with actual code changes.

Commit messages should be verbose by default consisting of a short subject line
(50 chars max), a blank line and detailed explanatory text as separate
paragraph(s), unless the title alone is self-explanatory (like "Corrected typo
in init.cpp") in which case a single title line is sufficient. Commit messages should be
helpful to people reading your code in the future, so explain the reasoning for
your decisions. Further explanation [here](http://chris.beams.io/posts/git-commit/).

If a particular commit references another issue, please add the reference, for
example `refs #1234`, or `fixes #4321`. Using the `fixes` or `closes` keywords
will cause the corresponding issue to be closed when the pull request is merged.

Please refer to the [Git manual](https://git-scm.com/doc) for more information
about Git.

- Push changes to your fork
- Create pull request

The title of the pull request should be prefixed by the component or area that
the pull request affects. Valid areas as:

- *Consensus* for changes to consensus critical code
- *Docs* for changes to the documentation
- *Qt* for changes to mqx-qt
- *Minting* for changes to the minting code
- *Net* or *P2P* for changes to the peer-to-peer network code
- *RPC/REST* for changes to the RPC or REST APIs
- *Scripts and tools* for changes to the scripts and tools
- *Tests* for changes to the mqx unit tests or QA tests
- *Trivial* should **only** be used for PRs that do not change generated
executable code. Notably, refactors (change of function arguments and code
reorganization) and changes in behavior should **not** be marked as trivial.
Examples of trivial PRs are changes to:
- comments
- whitespace
- variable names
- logging and messages
- *Utils and libraries* for changes to the utils and libraries
- *Wallet* for changes to the wallet code

Examples:

Consensus: Add new opcode for BIP-XXXX OP_CHECKAWESOMESIG
Net: Automatically create hidden service, listen on Tor
Qt: Add feed bump button
Trivial: Fix typo in init.cpp

If a pull request is specifically not to be considered for merging (yet) please
prefix the title with [WIP] or use [Tasks Lists](https://help.github.com/articles/basic-writing-and-formatting-syntax/#task-lists)
in the body of the pull request to indicate tasks are pending.

The body of the pull request should contain enough description about what the
patch does together with any justification/reasoning. You should include
references to any discussions (for example other tickets or mailing list
discussions).

At this stage one should expect comments and review from other contributors. You
can add more commits to your pull request by committing them locally and pushing
to your fork until you have satisfied all feedback.

Squashing Commits
---------------------------
If your pull request is accepted for merging, you may be asked by a maintainer
to squash and or [rebase](https://git-scm.com/docs/git-rebase) your commits
before it will be merged. The basic squashing workflow is shown below.

git checkout your_branch_name
git rebase -i HEAD~n
# n is normally the number of commits in the pull
# set commits from 'pick' to 'squash', save and quit
# on the next screen, edit/refine commit messages
# save and quit
git push -f # (force push to GitHub)

If you have problems with squashing (or other workflows with `git`), you can
alternatively enable "Allow edits from maintainers" in the right GitHub
sidebar and ask for help in the pull request.

Please refrain from creating several pull requests for the same change.
Use the pull request that is already open (or was created earlier) to amend
changes. This preserves the discussion and review that happened earlier for
the respective change set.

The length of time required for peer review is unpredictable and will vary from
pull request to pull request.


Pull Request Philosophy
-----------------------

Patch sets should always be focused. For example, a pull request could add a
feature, fix a bug, or refactor code; but not a mixture. Please also avoid super
pull requests which attempt to do too much, are overly large, or overly complex
as this makes review difficult.


### Features

When adding a new feature, thought must be given to the long term technical debt
and maintenance that feature may require after inclusion. Before proposing a new
feature that will require maintenance, please consider if you are willing to
maintain it (including bug fixing). If features get orphaned with no maintainer
in the future, they may be removed by the Repository Maintainer.


### Refactoring

Refactoring is a necessary part of any software project's evolution. The
following guidelines cover refactoring pull requests for the project.

There are three categories of refactoring, code only moves, code style fixes,
code refactoring. In general refactoring pull requests should not mix these
three kinds of activity in order to make refactoring pull requests easy to
review and uncontroversial. In all cases, refactoring PRs must not change the
behavior of code within the pull request (bugs must be preserved as is).

Project maintainers aim for a quick turnaround on refactoring pull requests, so
where possible keep them short, un-complex and easy to verify.


"Decision Making" Process
-------------------------

The following applies to code changes to the mqx Core project, and is not to be
confused with overall mqx Network Protocol consensus changes.

Whether a pull request is merged into mqx Core rests with the project merge
maintainers and ultimately the project lead.

Maintainers will take into consideration if a patch is in line with the general
principles of the project; meets the minimum standards for inclusion; and will
judge the general consensus of contributors.

In general, all pull requests must:

- have a clear use case, fix a demonstrable bug or serve the greater good of
the project (for example refactoring for modularisation);
- be well peer reviewed;
- follow code style guidelines;

Patches that change mqx consensus rules are considerably more involved than
normal because they affect the entire ecosystem and so must be preceded by
extensive discussions and clear detailing. While each case will be different,
one should be prepared to expend more time and effort than for other kinds of
patches because of increased peer review and consensus building requirements.


### Peer Review

Anyone may participate in peer review which is expressed by comments in the pull
request. Typically reviewers will review the code for obvious errors, as well as
test out the patch set and opine on the technical merits of the patch. Project
maintainers take into account the peer review when determining if there is
consensus to merge a pull request (remember that discussions may have been
spread out over GitHub, forums, email, and Slack discussions). The following
language is used within pull-request comments:

- ACK means "I have tested the code and I agree it should be merged";
- NACK means "I disagree this should be merged", and must be accompanied by
sound technical justification (or in certain cases of copyright/patent/licensing
issues, legal justification). NACKs without accompanying reasoning may be
disregarded;
- utACK means "I have not tested the code, but I have reviewed it and it looks
OK, I agree it can be merged";
- Concept ACK means "I agree in the general principle of this pull request";
- Nit refers to trivial, often non-blocking issues.

Reviewers should include the commit hash which they reviewed in their comments.

Project maintainers reserve the right to weigh the opinions of peer reviewers
using common sense judgement and also may weight based on meritocracy: Those
that have demonstrated a deeper commitment and understanding towards the project
(over time) or have clear domain expertise may naturally have more weight, as
one would expect in all walks of life.

Where a patch set affects consensus critical code, the bar will be set much
higher in terms of discussion and peer review requirements, keeping in mind that
mistakes could be very costly to the wider community. This includes refactoring
of consensus critical code.

Where a patch set proposes to change the mqx consensus, it must have been
discussed extensively on the forums and Slack, be accompanied by a widely
discussed Proposal and have a generally widely perceived technical consensus of being
a worthwhile change based on the judgement of the maintainers.

### Finding Reviewers

As most reviewers are themselves developers with their own projects, the review
process can be quite lengthy, and some amount of patience is required. If you find
that you've been waiting for a pull request to be given attention for several
months, there may be a number of reasons for this, some of which you can do something
about:

- It may be because of a feature freeze due to an upcoming release. During this time,
only bug fixes are taken into consideration. If your pull request is a new feature,
it will not be prioritized until the release is over. Wait for release.
- It may be because the changes you are suggesting do not appeal to people. Rather than
nits and critique, which require effort and means they care enough to spend time on your
contribution, thundering silence is a good sign of widespread (mild) dislike of a given change
(because people don't assume *others* won't actually like the proposal). Don't take
that personally, though! Instead, take another critical look at what you are suggesting
and see if it: changes too much, is too broad, doesn't adhere to the
[developer notes](doc/developer-notes.md), is dangerous or insecure, is messily written, etc.
Identify and address any of the issues you find. Then ask e.g. on Slack if someone could give
their opinion on the concept itself.
- It may be because your code is too complex for all but a few people. And those people
may not have realized your pull request even exists. A great way to find people who
are qualified and care about the code you are touching is the
[Git Blame feature](https://help.github.com/articles/tracing-changes-in-a-file/). Simply
find the person touching the code you are touching before you and see if you can find
them and give them a nudge. Don't be incessant about the nudging though.
- Finally, if all else fails, ask on Slack or elsewhere for someone to give your pull request
a look. If you think you've been waiting an unreasonably long amount of time (month+) for
no particular reason (few lines changed, etc), this is totally fine. Try to return the favor
when someone else is asking for feedback on their code, and universe balances out.


Release Policy
--------------

The project leader is the release manager for each mqx Core release.

Copyright
---------

By contributing to this repository, you agree to license your work under the
MIT license unless specified otherwise in `contrib/debian/copyright` or at
the top of the file itself. Any work contributed where you are not the original
author must contain its license header with the original author(s) and source.
24 COPYING
@@ -0,0 +1,24 @@
Copyright (c) 2009-2015 Bitcoin Developers
Copyright (c) 2014-2015 Dash Developers
Copyright (c) 2015-2017 The PIVX Developers
Copyright (c) 2017-2018 The SSX Developers
Copyright (c) 2018-2019 The mqx Developers


Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
13 INSTALL
@@ -0,0 +1,13 @@
Building MQX

Use the autogen script to prepare the build environment.

./autogen.sh
./configure
make

Always verify the signatures and checksums.

See doc/build-*.md for instructions on building mqxd,
the intended-for-services, no-graphical-interface, reference
implementation of MQX.
25 LICENSE
@@ -0,0 +1,25 @@
MIT License

Copyright (c) 2009-2015 Bitcoin Developers
Copyright (c) 2014-2015 Dash Developers
Copyright (c) 2015-2017 The PIVX Developers
Copyright (c) 2017-2018 The SSX Developers
Copyright (c) 2018-2019 The mqx Developers

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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