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Get Fuchsia source code

This guide provides instructions for the following tasks:

Before you start

We recommend you run ffx platform preflight before you continue. preflight examines your development machine and informs you of issues that may affect building Fuchsia from source or running the Fuchsia emulator.

  • For Linux, run:

    curl -sO && chmod +x ffx-linux-x64 && ./ffx-linux-x64 platform preflight
  • For MacOS, run:

    curl -sO && chmod +x ffx-macos-x64 && ./ffx-macos-x64 platform preflight


The Fuchsia project requires curl, unzip, and git to be up-to-date:

  • For Linux, install or update the following packages:

    sudo apt-get install curl git unzip
  • For macOS, install the Xcode command line tools:

    xcode-select --install

Download Fuchsia source

Fuchsia's bootstrap script creates a fuchsia directory and downloads the content of the Fuchsia source repository to this new directory.

To download the Fuchsia source, do the following:

  1. Select a directory for downloading the Fuchsia source code, for example:

    cd ~
  2. Run the bootstrap script:

    curl -s "" | base64 --decode | bash

    This script creates a fuchsia directory to download the source code. Downloading Fuchsia source can take up to 60 minutes.

    If you see the Invalid authentication credentials error during the bootstrapping process, see Authentication error for help.

Set up environment variables

Fuchsia recommends updating your shell script to perform the following actions (see Update your shell script for the instructions):

  • Add the .jiri_root/bin directory to your PATH.

    The .jiri_root/bin directory in the Fuchsia source contains the jiri and fx tools are essential to Fuchsia workflows. Fuchsia uses the jiri tool to manage repositories in the Fuchsia project. The fx tool helps configure, build, run, and debug Fuchsia. The Fuchsia toolchain requires jiri to be available in your PATH.

  • Source the scripts/ file.

    Although it's not required, sourcing the script enables useful shell functions in your terminal. For instance, it creates a FUCHSIA_DIR environment variable and provides the fd command for navigating directories with auto-completion (see comments in for more information).

Update your shell script

Update your shell script to add Fuchsia's environment variables in your terminal.

Do the following:

  1. Use a text editor to open your ~/.bash_profile file, for example:

    nano ~/.bash_profile
  2. Add the following lines to your ~/.bash_profile file:

    export PATH=~/fuchsia/.jiri_root/bin:$PATH
    source ~/fuchsia/scripts/
  3. Save the file and exit the text editor.

  4. To update your environment variables, run the following command:

    source ~/.bash_profile
  5. Verify that you can run the following commands inside your fuchsia directory without error:

    jiri help
    fx help

Next steps

See Configure and build Fuchsia in the Getting started guide for the next steps.


Authentication error

If you see the Invalid authentication credentials error during the bootstrap process, your ~/.gitcookies file may contain cookies from some repositories in that the bootstrap script wants to check out anonymously.

To resolve this error, do one of the following:

  • Follow the onscreen directions to get passwords for the specified repositories.
  • Delete the offending cookies from the .gitcookies file.

Work on Fuchsia without updating your PATH

The following sections provide alternative approaches to the Update your shell script section:

Copy the tool to your binary directory

If you don't wish to update your environment variables, but you want jiri to work in any directory, copy the jiri tool to your ~/bin directory, for example:

cp ~/fuchsia/.jiri_root/bin/jiri ~/bin

However, you must have write access to the ~/bin directory without sudo. If you don't, jiri cannot keep itself up-to-date.

Similarly, if you want to use the fx tool without updating your environment variables, provide the fx tool's symlink in your ~/bin directory, for example:

ln -s ~/fuchsia/scripts/fx ~/bin

Alternatively, run the fx tool directly using its path, for example:

./scripts/fx help

In either case, you need jiri in your PATH.