The Bitcoin ABC project welcomes contributors!
This guide is intended to help developers contribute effectively to Bitcoin ABC.
To get in contact with Bitcoin ABC developers, you can join the eCash Development Telegram group. The intent of this group is to facilitate development of Bitcoin ABC and other eCash node implementations. We welcome people who wish to participate.
Acceptable use of this group includes the following:
It is not for:
Bitcoin ABC aims for fast iteration and continuous integration.
This means that there should be quick turnaround for patches to be proposed, reviewed, and committed. Changes should not sit in a queue for long.
Here are some tips to help keep the development working as intended. These are guidelines for the normal and expected development process. Developers can use their judgement to deviate from these guidelines when they have a good reason to do so.
Here are some handy links for development practices aligned with Bitcoin ABC:
Create an account at reviews.bitcoinabc.org
Install Git and Arcanist on your machine
To install these packages on Debian or Ubuntu, type: sudo apt-get install git arcanist
Git documentation can be found at git-scm.com.
For Arcanist documentation, you can read Arcanist Quick Start and the Arcanist User Guide.
The Phabricator version of Arcanist is unmaintained and does not work with PHP 8 or higher. This is an issue for Linux distributions such as Ubuntu 22.04. In this case, you can use the Phorge version of Arcanist instead.
Type: ssh-keygen -t ed25519 -C "[email protected]"
Enter a file in which to save the key (/home/username/.ssh/id_ed25519): [Press enter]
Go to: https://reviews.bitcoinabc.org/settings/user/*username*/page/ssh/
Under “SSH Key Actions”, Select “Upload Public Key”
Paste contents from: /home/*username*/.ssh/id_ed25519.pub
git clone ssh://[email protected]:2221/source/bitcoin-abc.git
cd bitcoin-abc
arc install-certificate
Note: Arcanist tooling will tend to fail if your remote origin is set to something other than the above. A common mistake is to clone from Github and then forget to update your remotes.
Follow instructions provided by arc install-certificate to provide your API token.
During submission of patches, arcanist will automatically run arc lint to
enforce Bitcoin ABC code formatting standards, and often suggests changes.
If code formatting tools do not install automatically on your system, you
will have to install the following:
Install all the code formatting tools on Debian Bullseye/Bookworm (11/12) or Ubuntu 24.04:
sudo apt-get install clang-format-16 clang-tidy-16 python3-pip php-codesniffer shellcheck yamllint
# Depending on your distribution policy you might need to pass the
# --break-system-packages to the below pip3 call
pip3 install "black>=24.0" "isort>=5.6.4" "mypy>=0.910" "flynt>=0.78" "flake8>=5" flake8-comprehensions flake8-builtins "djlint>=1.34.1"
echo "export PATH=\"`python3 -m site --user-base`/bin:\$PATH\"" >> ~/.bashrc
source ~/.bashrc
If not available in the distribution, clang-format-16 and clang-tidy-16 can be
installed from https://releases.llvm.org/download.html or https://apt.llvm.org.
If you are modifying a shell script, you will need to install the shellcheck linter.
A recent version is required and may not be packaged for your distribution.
Standalone binaries are available for download on
the project’s github release page.
Note: In order for arcanist to detect the shellcheck executable, you need to make it available in your PATH;
if another version is already installed, make sure the recent one is found first.
Arcanist will tell you what version is expected and what is found when running arc lint against a shell script.
If you are running Debian 10, it is also available in the backports repository:
sudo apt-get -t buster-backports install shellcheck
If you are modifying Rust files, you will need to install a stable rust version, plus a nightly toolchain called “abc-nightly” for formatting:
# Install latest stable Rust version
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s
source ~/.cargo/env
rustup install nightly-2023-08-23
rustup component add rustfmt --toolchain nightly-2023-08-23
# Name the nightly toolchain "abc-nightly"
rustup toolchain link abc-nightly "$(rustc +nightly-2023-08-23 --print sysroot)"
To contribute to web projects, you will need nodejs > 20 and npm > 10.8.3.
Follow these installation instructions
to install nodejs with node version manager.
Then:
cd bitcoin-abc
[sudo] nvm install 20
[sudo] npm install -g npm@latest
[sudo] npm install -g [email protected]
[sudo] npm install -g [email protected]
Some repositories have a .nvmrc file which specifies the version of node expected.
For example, to work in Cashtab,
cd bitcoin-abc/cashtab
nvm use
The specified version of nodejs will be installed and used.
To work on the extension, you will need browserify
[sudo] npm install -g browserify
See the dedicated CONTRIBUTING.md document.
A typical workflow would be:
Create a topic branch in Git for your changes
git checkout -b ‘my-topic-branch’
Make your changes, and commit them
git commit -a -m ‘my-commit’
Create a differential with Arcanist
arc diff
You should add suggested reviewers and a test plan to the commit message. Note that Arcanist is set up to look only at the most-recent commit message, So all you changes for this Diff should be in one Git commit.
For large changes, break them into several Diffs, as described in this
guide.
You must also include “Depends on Dxxx” in the Arcanist summary to indicate
dependence on other Diffs. Note: the arc land procedure described in the
guide above is obsolete. With the most recent version of arcanist, you may
arc land the latest commit of your stacked diff after all parts are approved.
Log into Phabricator to see review and feedback.
Make changes as suggested by the reviewers. You can simply edit the files
with my-topic-branch checked out, and then type arc diff. Arcanist will
give you the option to add uncommited changes. Or, alternatively, you can
commit the changes using git commit -a --am to add them to the last commit,
or squash multiple commits by typing git rebase -i master. If you squash,
make sure the commit message has the information needed for arcanist (such
as the Diff number, reviewers, etc.).
Update your Diff by typing arc diff again.
When reviewers approve your Diff, it should be listed as “ready to Land”
in Phabricator. When you want to commit your diff to the repository, check out
type my-topic-branch in git, then type arc land. You have now successfully
committed a change to the Bitcoin ABC repository.
When reviewing a Diff, apply the changeset on your local by using
arc patch D{NNNN}
You will likely be re-writing git histories multiple times, which causes
timestamp changes that require re-building a significant number of files. It’s
highly recommended to install ccache (re-run cmake if you install it
later), as this will help cut your re-build times from several minutes to under
a minute, in many cases.
If you are looking for a useful task to contribute to the project, a good place to start is the list of tasks at https://reviews.bitcoinabc.org/maniphest.
You could also try backporting some code from Bitcoin Core.
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.
See DISCLOSURE_POLICY.