Linux Arcanist Installation Guide

Arcanist and moz-phab can be installed into any location on your system, as long as the arc and moz-phab commands work from your command line.

In this guide we’ll be installing arc and moz-phab into ~/.mozbuild, however they can be installed into any reasonable location.

Ensure PHP and git are installed

Verify that both php and git are installed and working when run from the command line:

$ git --version
git version 2.20.1
$ php --version
PHP 7.1.23 (cli) (built: Nov  7 2018 18:20:35) ( NTS )

The versions you have do not need match the above.

If either are missing use your distro’s package manager to install. For example if you use Ubuntu:

sudo apt-get install php php-curl git

Note Arcanist requires the ext-curl and other PHP extensions which may not be enabled by default on your Linux distro. For example Ubuntu requires that you install the php-curl package, while Fedora also require the php-json package.

Install Arcanist

  1. Create a ~/.mozbuild directory if it doesn’t already exist and clone the arcanist and phabricator library repositories:
mkdir -p ~/.mozbuild
cd ~/.mozbuild
git clone
git clone

Install moz-phab

  1. Create a ~/.mozbuild/moz-phab directory and download the latest version of moz-phab:
mkdir -p ~/.mozbuild/moz-phab
cd ~/.mozbuild/moz-phab
curl -O$(basename $(curl -sLo /dev/null -w '%{url_effective}'
chmod +x moz-phab

Add arc and moz-phab to your PATH

Both arc and moz-phab need to be on the PATH in order for the scripts to work. Be aware the profile file varies between distros and shells (eg. ~/.bashrc instead of ~/.profile)

  1. Update your PATH to include arcanist and moz-phab:
echo 'export PATH="$HOME/.mozbuild/arcanist/bin:$HOME/.mozbuild/moz-phab:$PATH"' >> ~/.profile
  1. Close and reopen your terminal program
  2. Ensure running arc and moz-phab both work:
arc -h
moz-phab -h