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Contributing to Dash Core
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============================
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The Dash 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.
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First, in terms of structure, there is no particular concept of "Dash Core
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developers" in the sense of privileged people. Open source often naturally
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revolves around a meritocracy where contributors earn trust from the developer
community over time. Nevertheless, 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
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[release cycle ](/doc/release-process.md ) as well as overall merging, moderation
and appointment of maintainers.
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Getting Started
---------------
New contributors are very welcome and needed.
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Reviewing and testing is highly valued and the most effective way you can contribute
as a new contributor. It also will teach you much more about the code and
process than opening pull requests. Please refer to the [peer review ](#peer-review )
section below.
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Before you start contributing, familiarize yourself with the Dash Core build
system and tests. Refer to the documentation in the repository on how to build
Dash Core and how to run the unit and functional tests.
There are many open issues of varying difficulty waiting to be fixed.
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If you're looking for somewhere to start contributing, check out the
[good first issue ](https://github.com/dashpay/dash/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22 )
list.
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Some of them might no longer be applicable. So if you are interested, but
unsure, you might want to leave a comment on the issue first.
### Good First Issue Label
The purpose of the `good first issue` label is to highlight which issues are
suitable for a new contributor without a deep understanding of the codebase.
However, good first issues can be solved by anyone. If they remain unsolved
for a longer time, a frequent contributor might address them.
You do not need to request permission to start working on an issue. However,
you are encouraged to leave a comment if you are planning to work on it. This
will help other contributors monitor which issues are actively being addressed
and is also an effective way to request assistance if and when you need it.
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Communication Channels
----------------------
Most communication about Dash Core development happens on Discord Server.
Discussion about codebase improvements happens in GitHub issues and pull
requests.
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Contributor Workflow
--------------------
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The codebase is maintained using the "contributor workflow" where everyone
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without exception contributes patch proposals using "pull requests" (PRs). This
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facilitates social contribution, easy testing and peer review.
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To contribute a patch, the workflow is as follows:
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1. Fork repository ([only for the first time](https://docs.github.com/en/get-started/quickstart/fork-a-repo))
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1. Create topic branch
1. Commit patches
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The project coding conventions in the [developer notes ](doc/developer-notes.md )
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must be followed.
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### Committing Patches
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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
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fixes or code moves with actual code changes.
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Make sure each individual commit is hygienic: that it builds successfully on its
own without warnings, errors, regressions, or test failures.
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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
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paragraph(s), unless the title alone is self-explanatory (like "Correct typo
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in init.cpp") in which case a single title line is sufficient. Commit messages should be
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helpful to people reading your code in the future, so explain the reasoning for
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your decisions. Further explanation [here ](https://chris.beams.io/posts/git-commit/ ).
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If a particular commit references another issue, please add the reference. For
example: `refs #1234` or `fixes #4321` . Using the `fixes` or `closes` keywords
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will cause the corresponding issue to be closed when the pull request is merged.
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Commit messages should never contain any `@` mentions (usernames prefixed with "@").
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Please refer to the [Git manual ](https://git-scm.com/doc ) for more information
about Git.
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- Push changes to your fork
- Create pull request
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### Creating the Pull Request
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Pull request titles should follow the Conventional Commits specification which
uses the `<type>(optional scope): <description>` scheme. Please see the
specification linked below for valid types. When making a change to a specific
component, please specify the name of the component inside the scope. For
example, if you are developing a new feature related to consensus, the PR title
should look like this: `feat(consensus): amazing new feature` . Breaking changes
should be designated by appending an exclamation point after `<type>(scope)`
like this: `feat(rpc)!: remove deprecated rpc` .
For more details on allowed types and more information about Conventional
Commits, please see the [Conventional Commits
specification](https://www.conventionalcommits.org/en/v1.0.0/). In addition to
typical types, the `backport` type should be used for bitcoin backport PRs. For
all available types and scopes, please see the
[.github/semantic.yml ](.github/semantic.yml ) file. Commonly used scopes ones
include:
- *consensus* for changes to consensus critical code
- *log* Changes to log messages
- *mining* for changes to the mining code
- *net* for changes to the peer-to-peer network code
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- *qt* for changes to dash-qt
- *rest* for changes to the REST APIs
- *rpc* for changes to the RPC APIs
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- *scripts* for changes to the scripts and tools
- *utils* for changes to the utils and libraries
- *wallet* for changes to the wallet code
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- *zmq* for changes to the ZMQ APIs
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- *guix* for changes to the GUIX reproducible builds
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Examples:
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feat(consensus): add new opcode for BIP-XXXX OP_CHECKAWESOMESIG
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feat(net): automatically create onion service, listen on Tor
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feat(qt): add feed bump button
fix(log): fix typo in log message
feat(rpc)!: modify gettransaction parameter type
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The body of the pull request should contain sufficient description of *what* the
patch does, and even more importantly, *why* , with justification and reasoning.
You should include references to any discussions (for example, other issues or
mailing list discussions).
The description for a new pull request should not contain any `@` mentions. The
PR description will be included in the commit message when the PR is merged and
any users mentioned in the description will be annoyingly notified each time a
fork of Dash Core copies the merge. Instead, make any username mentions in a
subsequent comment to the PR.
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### Translation changes
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Note that translations should not be submitted as pull requests. Please see
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[Translation Process ](https://github.com/dashpay/dash/blob/master/doc/translation_process.md )
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for more information on helping with translations.
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### Work in Progress Changes and Requests for Comments
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If a pull request is not to be considered for merging (yet), please
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prefix the title with [WIP] or use [Tasks Lists ](https://docs.github.com/en/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#task-lists )
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in the body of the pull request to indicate tasks are pending.
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### Address Feedback
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At this stage, one should expect comments and review from other contributors. You
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can add more commits to your pull request by committing them locally and pushing
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to your fork.
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You are expected to reply to any review comments before your pull request is
merged. You may update the code or reject the feedback if you do not agree with
it, but you should express so in a reply. If there is outstanding feedback and
you are not actively working on it, your pull request may be closed.
Please refer to the [peer review ](#peer-review ) section below for more details.
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### Squashing Commits
If your pull request contains fixup commits (commits that change the same line of code repeatedly) or too fine-grained
commits, you may be asked to [squash ](https://git-scm.com/docs/git-rebase#_interactive_mode ) your commits
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before it will be reviewed. The basic squashing workflow is shown below.
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git checkout your_branch_name
git rebase -i HEAD~n
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# n is normally the number of commits in the pull request.
# Set commits (except the one in the first line) from 'pick' to 'squash', save and quit.
# On the next screen, edit/refine commit messages.
# Save and quit.
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git push -f # (force push to GitHub)
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Please update the resulting commit message, if needed. It should read as a
coherent message. In most cases, this means not just listing the interim
commits.
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If your change contains a merge commit, the above workflow may not work and you
will need to remove the merge commit first. See the next section for details on
how to rebase.
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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.
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The length of time required for peer review is unpredictable and will vary from
pull request to pull request.
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### Rebasing Changes
When a pull request conflicts with the target branch, you may be asked to rebase it on top of the current target branch.
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git fetch https://github.com/bitcoin/bitcoin # Fetch the latest upstream commit
git rebase FETCH_HEAD # Rebuild commits on top of the new base
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Avoid rebasing a non-conflicting pull request on top of the updated target
branch if you requested a review already. If you need to tweak some commit in
the middle, please rebase your branch on top of the same commit it was
originally based on. Non-conflicting pull requests should be rebased on top of
the current target branch by maintainers only.
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This project aims to have a clean git history, where code changes are only made in non-merge commits. This simplifies
auditability because merge commits can be assumed to not contain arbitrary code changes. Merge commits should be signed,
and the resulting git tree hash must be deterministic and reproducible. The script in
[/contrib/verify-commits ](/contrib/verify-commits ) checks that.
After a rebase, reviewers are encouraged to sign off on the force push. This should be relatively straightforward with
the `git range-diff` tool explained in the [productivity
notes](/doc/productivity.md#diff-the-diffs-with-git-range-diff). To avoid needless review churn, maintainers will
generally merge pull requests that received the most review attention first.
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Pull Request Philosophy
-----------------------
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Patchsets 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.
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### Features
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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.
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### Refactoring
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Refactoring is a necessary part of any software project's evolution. The
following guidelines cover refactoring pull requests for the project.
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There are three categories of refactoring: code-only moves, code style fixes, and
code refactoring. In general, refactoring pull requests should not mix these
three kinds of activities in order to make refactoring pull requests easy to
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review and uncontroversial. In all cases, refactoring PRs must not change the
behaviour of code within the pull request (bugs must be preserved as is).
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Project maintainers aim for a quick turnaround on refactoring pull requests, so
where possible keep them short, uncomplex and easy to verify.
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"Decision Making" Process
-------------------------
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The following applies to code changes to the Dash Core project (and related
projects such as libsecp256k1), and is not to be confused with overall Dash
Network Protocol consensus changes.
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Whether a pull request is merged into Dash Core rests with the project merge
maintainers and ultimately the project lead.
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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.
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In general, all pull requests must:
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- Have a clear use case, fix a demonstrable bug or serve the greater good of
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the project (for example refactoring for modularisation);
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- Be well peer-reviewed;
- Have unit tests, functional tests, and fuzz tests, where appropriate;
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- Follow code style guidelines ([C++](doc/developer-notes.md), [functional tests ](test/functional/README.md ));
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- Not break the existing test suite;
- Where bugs are fixed, where possible, there should be unit tests
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demonstrating the bug and also proving the fix. This helps prevent regression.
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- Change relevant comments and documentation when behaviour of code changes.
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Patches that change Dash consensus rules are considerably more involved than
normal because they affect the entire ecosystem and so must be preceded by
extensive mailing list discussions and have a numbered BIP. 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.
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### Peer Review
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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
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spread out over GitHub, mailing list and IRC discussions).
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Code review is a burdensome but important part of the development process, and
as such, certain types of pull requests are rejected. In general, if the
**improvements** do not warrant the **review effort** required, the PR has a
high chance of being rejected. It is up to the PR author to convince the
reviewers that the changes warrant the review effort, and if reviewers are
"Concept NACK'ing" the PR, the author may need to present arguments and/or do
research backing their suggested changes.
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#### Conceptual Review
A review can be a conceptual review, where the reviewer leaves a comment
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* `Concept (N)ACK` , meaning "I do (not) agree with the general goal of this pull
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request",
* `Approach (N)ACK` , meaning `Concept ACK` , but "I do (not) agree with the
approach of this change".
#### Code Review
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After conceptual agreement on the change, code review can be provided. A review
begins with `ACK BRANCH_COMMIT` , where `BRANCH_COMMIT` is the top of the PR
branch, followed by a description of how the reviewer did the review. The
following language is used within pull request comments:
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- (t)ACK means "I have tested the code and I agree it should be merged",
involving change-specific manual testing in
addition to running the unit, functional, or fuzz tests, and in case it is
not obvious how the manual testing was done, it should be described;
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- NACK means "I disagree this should be merged", and must be accompanied by
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sound technical justification (or in certain cases of copyright/patent/licensing
issues, legal justification). NACKs without accompanying reasoning may be
disregarded;
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- utACK means "I have not tested the code, but I have reviewed it and it looks
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OK, I agree it can be merged";
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- A "nit" refers to a trivial, often non-blocking issue.
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Project maintainers reserve the right to weigh the opinions of peer reviewers
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using common sense judgement and may also weigh based on merit. Reviewers that
have demonstrated a deeper commitment and understanding of the project over time
or who have clear domain expertise may naturally have more weight, as one would
expect in all walks of life.
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Where a patch set affects consensus-critical code, the bar will be much
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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
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of consensus-critical code.
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Where a patch set proposes to change the Dash consensus, it must have been
discussed extensively on the mailing list and IRC, be accompanied by a widely
discussed BIP and have a generally widely perceived technical consensus of being
a worthwhile change based on the judgement of the maintainers.
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#### Verifying a Rebase
When someone rebases their PR, it can often be very difficult to ensure that
extra changes were not included in that force push. This changes could be anything
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from merge conflicts to someone attempting to sneak something into the PR.
In order for `git range-diff` to work, both the before and after commits must be
present locally. See chapter [rebasing changes ](#rebasing-changes )
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### Finding Reviewers
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The review process is normally fairly responsive on the Dash Core repository, however
this might not always be the case. 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:
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- 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,
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it will not be prioritized until after the release. Wait for the release.
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- 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.
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Identify and address any of the issues you find. Then ask e.g. on the forum or on a community
discord if someone could give their opinion on the concept itself.
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- It may be because your code is too complex for all but a few people, and those people
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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
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[Git Blame feature ](https://docs.github.com/en/github/managing-files-in-a-repository/managing-files-on-github/tracking-changes-in-a-file ). Simply
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look up who last modified the code you are changing and see if you can find
them and give them a nudge. Don't be incessant about the nudging, though.
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- Finally, if all else fails, ask on discord or elsewhere for someone to give your pull request
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a look. If you think you've been waiting for an unreasonably long time (say,
more than a month) for no particular reason (a few lines changed, etc.),
this is totally fine. Try to return the favor when someone else is asking
for feedback on their code, and the universe balances out.
- Remember that the best thing you can do while waiting is give review to others!
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Backporting
-----------
Security and bug fixes can be backported from `master` to release
branches.
If the backport is non-trivial, it may be appropriate to open an
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additional PR to backport the change, but only after the original PR
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has been merged.
Otherwise, backports will be done in batches and
the maintainers will use the proper `Needs backport (...)` labels
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when needed (the original author does not need to worry about it).
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A backport should contain the following metadata in the commit body:
```
Github-Pull: #< PR number >
Rebased-From: < commit hash of the original commit >
```
Have a look at [an example backport PR](
https://github.com/bitcoin/bitcoin/pull/16189).
Also see the [backport.py script](
https://github.com/bitcoin-core/bitcoin-maintainer-tools#backport).
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Bitcoin Backports are an incredibly valuable part of Dash's development. Backporting allows us to easily implement new
features, improvements and fixes as bitcoin implements them.
To see detailed statistics & progress see Google Sheet tracker: [Bitcoin backports for Dash ](https://docs.google.com/spreadsheets/d/1DnKxat0S0H62CJOzXpKGPXTa8hgoVOjGYZzoClmGSB8/edit?usp=sharing ).
You should use this sheet to find what PRs to backport and its commit.
Updating the Spreadsheet
-------------------
To keep the spreadsheet up to date we need to pull merges made to Bitcoin for each version.
### Adding Bitcoin Remote
If you have not already, add the bitcoin repo as a remote:
```
git remote add bitcoin git@github.com:bitcoin/bitcoin.git
```
This allows you to easily cherry-pick merges and look into logs of bitcoin without switching directories.
### Pulling Merges
To pull the most up-to-date merges first make sure bitcoin is up-to-date:
```
git fetch bitcoin
```
To create a text file with all the merges between two versions, use:
```
git log --first-parent --oneline bitcoin/< version_start > ..bitcoin/< version_end > >> < filename > .txt
```
This will pull all the backports for `<version_start>` up until `<version_end>` .
`<filename>` will be the name of the file the where all the merges are written to.
#### For example
The command
```
git log --first-parent --oneline bitcoin/0.14..bitcoin/0.15 >> backports_0.14-0.15.txt
```
will pull all merges made to Bitcoin version 0.14 until the start of version 15 and write to `backports_0.14-0.15.txt` .
#### NOTE:
In order to pull the most recent merges, that is, for a version that is not yet released, run:
```
git log --first-parent --oneline bitcoin/< cur_ver > ..bitcoin/master >> < filename > .txt
```
this will pull all the merges made to Bitcoin since the release of the current version.
### Adding the Merges to Spreadsheet
Opening the text file, you will notice that the merges are in ascending order with the most recent at the top. We need
to reverse this order to allow us to merge them in order. Simply run:
```
tail -r < filename > .txt >> < filename > _rev.text
```
This will create a text file with all the original file's lines in descending order. We can now copy this file and paste
the contents onto the [Tracker ](https://docs.google.com/spreadsheets/d/1DnKxat0S0H62CJOzXpKGPXTa8hgoVOjGYZzoClmGSB8/edit?usp=sharing ).
When pasting the contents, make sure to split the values into the cells so every line is not present under commit hash.
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Copyright
---------
2019-07-30 05:40:39 +02:00
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
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author must contain its license header with the original author(s) and source.