docs/get-started/get_fuchsia_source.md - fuchsia - Git at Google

 # Download the Fuchsia source code

 This guide provides instructions on how to download the
 Fuchsia source code and set up the Fuchsia development
 environment on your machine.

 The steps are:

 1. [Perform a preflight check](#perform-a-preflight-check).
 2. [Install prerequisite packages](#install-prerequisite-packages).
 3. [Download the Fuchsia source code](#download-the-fuchsia-source-code).
 4. [Set up environment variables](#set-up-environment-variables).
 5. [Configure firewall rules (Optional)](#configure-firewall-rules).


 ## 1. Perform a preflight check {#perform-a-preflight-check}

 Fuchsia provides a preflight check tool
 ([`ffx platform preflight`][ffx-platform-preflight])
 that examines your machine and informs you of any issues that may
 affect building Fuchsia from source on the machine.

 Note: The preflight tool only works for the x64 architecture. Fuchsia
 is currently not guaranteed to build successfully on other host
 architectures, such as Windows and ARM64.

 Run the following command:

 * {Linux}

   ```posix-terminal
   curl -sO https://storage.googleapis.com/fuchsia-ffx/ffx-linux-x64 && chmod +x ffx-linux-x64 && ./ffx-linux-x64 platform preflight
   ```

 * {macOS}

   ```posix-terminal
   curl -sO https://storage.googleapis.com/fuchsia-ffx/ffx-macos-x64 && chmod +x ffx-macos-x64 && ./ffx-macos-x64 platform preflight
   ```

 ## 2. Install prerequisite packages {#install-prerequisite-packages}

 Fuchsia requires `curl`, `file`, `unzip`, and `git` to be up to date. The version
 of `git` needs to be 2.28 or higher.

 * {Linux}

   Install (or update) the following packages:

   ```posix-terminal
   sudo apt install curl file git unzip
   ```

 * {macOS}

   Install the Xcode command line tools:

   Note: Skip this step if `ffx platform preflight` shows that Xcode tools
   are already installed on your machine.

   ```posix-terminal
   xcode-select --install
   ```

 ## 3. Download the Fuchsia source code {#download-the-fuchsia-source-code}

 Fuchsia provides a [bootstrap script](/scripts/bootstrap) that creates a
 directory named `fuchsia` and downloads the Fuchsia source code in that
 directory.

 Downloading the Fuchsia source code requires about 2 GB of space
 on your machine. Depending on your build configuration, you need
 another 80 to 90 GB of space later when you build Fuchsia. Additionally,
 the download process uses a substantial amount of memory. It is advisible
 to close non-crucial processes during this time.

 To download the Fuchsia source, do the following:

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

     Note: You can set up Fuchsia in any directory. This guide selects
     the `$HOME` directory as an example.

     ```posix-terminal
     cd $HOME
     ```

 1.  Run the bootstrap script:

     Note: Downloading the Fuchsia source code can take up to 60 minutes.

     ```posix-terminal
     curl -s "https://fuchsia.googlesource.com/fuchsia/+/HEAD/scripts/bootstrap?format=TEXT" | base64 --decode | bash
     ```
     This script creates the `fuchsia` directory and downloads the source code.

     If you see the `Invalid authentication credentials` error during the
     bootstrapping process, see [Authentication error](#authentication-error) for
     help.

 ## 4. Set up environment variables {#set-up-environment-variables}

 Fuchsia recommends that you update your shell profile to include the following
 actions:

 *   Add the `.jiri_root/bin` directory to your `PATH`.

     The `.jiri_root/bin` directory in the Fuchsia source contains the
     [`jiri`](https://fuchsia.googlesource.com/jiri) and
     [`fx`](/docs/development/build/fx.md) tools that are essential to
     Fuchsia workflows. Fuchsia uses the `jiri` tool to manage repositories in
     the Fuchsia project, and the `fx` tool helps configure, build, run, and
     debug Fuchsia. The Fuchsia toolchain requires that `jiri` is available in
     your `PATH`.

 *   Source the `scripts/fx-env.sh` file.

     Though it's not required, sourcing the
     [`fx-env.sh`](/scripts/fx-env.sh) script enables a number of
     useful shell functions in your terminal. For instance, it creates the
     `FUCHSIA_DIR` environment variable and provides the `fd` command for
     navigating directories with auto-completion. (For more information, see
     comments in `fx-env.sh`.)

 Note: If you don't wish to update your shell profile, see
 [Work on Fuchsia without updating your PATH](#work-on-fuchsia-without-updating-your-path)
 in Appendices instead.

 To update your shell profile to configure Fuchsia's environment variables,
 do the following:

 1.  Use a text editor to open your `~/.bash_profile` file (in the example below,
     we use the [Nano][nano]{:.external} text editor):

     Note: This guide uses a `bash` terminal as an example. If you're
     using `zsh`, replace `~/.bash_profile` with `~/.zprofile` in the
     following steps:

     ```posix-terminal
     nano ~/.bash_profile
     ```

 1.  Add the following lines to your `~/.bash_profile` file:

     Note: If your Fuchsia source code is not located in the `~/fuchsia`
     directory, replace `~/fuchsia` with your Fuchsia directory.

     ```sh
     export PATH=~/fuchsia/.jiri_root/bin:$PATH
     source ~/fuchsia/scripts/fx-env.sh
     ```

 1.  Save the file and exit the text editor.

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

     ```posix-terminal
     source ~/.bash_profile
     ```

 1.  Verify that you can run the following commands inside your
     `fuchsia` directory without error:

     ```posix-terminal
     jiri help
     ```

     ```posix-terminal
     fx help
     ```

 ## 5. Configure firewall rules (Optional) {#configure-firewall-rules}

 Note: This step is not required for building or running Fuchsia. But it is
 recommended to ensure that Fuchsia's emulator instances run smoothly on Linux.

 (**Linux only**) If you're planning on running Fuchsia on Linux, it is advised to
 run the following command to allow Fuchsia-specific traffic on the host machine:

 ```posix-terminal
 fx setup-ufw
 ```

 This script requires `sudo` (which asks for your password) to set the appropriate
 firewall rules. (For more information on this script, see [`setup-ufw`][setup-ufw].)

 ## Next steps

 To build your first Fuchsia system image, see
 [Configure and build Fuchsia](/docs/get-started/build_fuchsia.md).

 ## Appendices

 ### Authentication error {#authentication-error}

 If you see the `Invalid authentication credentials` error during the bootstrap
 process, your `~/.gitcookies` file may contain cookies from some repositories in
 `googlesource.com` 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 {#work-on-fuchsia-without-updating-your-path}

 The following sections provide alternative approaches to the
 [Set up environment variables](#set-up-environment-variables) section:

 *   [Copy the tool to your binary directory](#copy-the-tool-to-your-binary-directory)
 *   [Add a symlink to your binary directory](#add-a-symlink-to-your-binary-directory)

 #### Copy the tool to your binary directory {#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:

 Note: If your Fuchsia source code is not located in the `~/fuchsia` directory,
 replace `~/fuchsia` with your Fuchsia directory.

 ```posix-terminal
 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.

 #### Add a symlink to your binary directory {#add-a-symlink-to-your-binary-directory}

 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:

 Note: If your Fuchsia source code is not located in the `~/fuchsia` directory,
 replace `~/fuchsia` with your Fuchsia directory.

 ```posix-terminal
 ln -s ~/fuchsia/scripts/fx ~/bin
 ```

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

 ```posix-terminal
 ./scripts/fx help
 ```

 In either case, you need `jiri` in your `PATH`.

 <!-- Reference links -->

 [ffx-platform-preflight]: https://fuchsia.dev/reference/tools/sdk/ffx#preflight
 [nano]: https://www.nano-editor.org/docs.php
 [setup-ufw]: https://fuchsia.dev/reference/tools/fx/cmd/setup-ufw
	# Download the Fuchsia source code

	This guide provides instructions on how to download the
	Fuchsia source code and set up the Fuchsia development
	environment on your machine.

	The steps are:

	1. [Perform a preflight check](#perform-a-preflight-check).
	2. [Install prerequisite packages](#install-prerequisite-packages).
	3. [Download the Fuchsia source code](#download-the-fuchsia-source-code).
	4. [Set up environment variables](#set-up-environment-variables).
	5. [Configure firewall rules (Optional)](#configure-firewall-rules).


	## 1. Perform a preflight check {#perform-a-preflight-check}

	Fuchsia provides a preflight check tool
	([`ffx platform preflight`][ffx-platform-preflight])
	that examines your machine and informs you of any issues that may
	affect building Fuchsia from source on the machine.

	Note: The preflight tool only works for the x64 architecture. Fuchsia
	is currently not guaranteed to build successfully on other host
	architectures, such as Windows and ARM64.

	Run the following command:

	* {Linux}

	```posix-terminal
	curl -sO https://storage.googleapis.com/fuchsia-ffx/ffx-linux-x64 && chmod +x ffx-linux-x64 && ./ffx-linux-x64 platform preflight
	```

	* {macOS}

	```posix-terminal
	curl -sO https://storage.googleapis.com/fuchsia-ffx/ffx-macos-x64 && chmod +x ffx-macos-x64 && ./ffx-macos-x64 platform preflight
	```

	## 2. Install prerequisite packages {#install-prerequisite-packages}

	Fuchsia requires `curl`, `file`, `unzip`, and `git` to be up to date. The version
	of `git` needs to be 2.28 or higher.

	* {Linux}

	Install (or update) the following packages:

	```posix-terminal
	sudo apt install curl file git unzip
	```

	* {macOS}

	Install the Xcode command line tools:

	Note: Skip this step if `ffx platform preflight` shows that Xcode tools
	are already installed on your machine.

	```posix-terminal
	xcode-select --install
	```

	## 3. Download the Fuchsia source code {#download-the-fuchsia-source-code}

	Fuchsia provides a [bootstrap script](/scripts/bootstrap) that creates a
	directory named `fuchsia` and downloads the Fuchsia source code in that
	directory.

	Downloading the Fuchsia source code requires about 2 GB of space
	on your machine. Depending on your build configuration, you need
	another 80 to 90 GB of space later when you build Fuchsia. Additionally,
	the download process uses a substantial amount of memory. It is advisible
	to close non-crucial processes during this time.

	To download the Fuchsia source, do the following:

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

	Note: You can set up Fuchsia in any directory. This guide selects
	the `$HOME` directory as an example.

	```posix-terminal
	cd $HOME
	```

	1. Run the bootstrap script:

	Note: Downloading the Fuchsia source code can take up to 60 minutes.

	```posix-terminal
	curl -s "https://fuchsia.googlesource.com/fuchsia/+/HEAD/scripts/bootstrap?format=TEXT" \| base64 --decode \| bash
	```
	This script creates the `fuchsia` directory and downloads the source code.

	If you see the `Invalid authentication credentials` error during the
	bootstrapping process, see [Authentication error](#authentication-error) for
	help.

	## 4. Set up environment variables {#set-up-environment-variables}

	Fuchsia recommends that you update your shell profile to include the following
	actions:

	* Add the `.jiri_root/bin` directory to your `PATH`.

	The `.jiri_root/bin` directory in the Fuchsia source contains the
	[`jiri`](https://fuchsia.googlesource.com/jiri) and
	[`fx`](/docs/development/build/fx.md) tools that are essential to
	Fuchsia workflows. Fuchsia uses the `jiri` tool to manage repositories in
	the Fuchsia project, and the `fx` tool helps configure, build, run, and
	debug Fuchsia. The Fuchsia toolchain requires that `jiri` is available in
	your `PATH`.

	* Source the `scripts/fx-env.sh` file.

	Though it's not required, sourcing the
	[`fx-env.sh`](/scripts/fx-env.sh) script enables a number of
	useful shell functions in your terminal. For instance, it creates the
	`FUCHSIA_DIR` environment variable and provides the `fd` command for
	navigating directories with auto-completion. (For more information, see
	comments in `fx-env.sh`.)

	Note: If you don't wish to update your shell profile, see
	[Work on Fuchsia without updating your PATH](#work-on-fuchsia-without-updating-your-path)
	in Appendices instead.

	To update your shell profile to configure Fuchsia's environment variables,
	do the following:

	1. Use a text editor to open your `~/.bash_profile` file (in the example below,
	we use the [Nano][nano]{:.external} text editor):

	Note: This guide uses a `bash` terminal as an example. If you're
	using `zsh`, replace `~/.bash_profile` with `~/.zprofile` in the
	following steps:

	```posix-terminal
	nano ~/.bash_profile
	```

	1. Add the following lines to your `~/.bash_profile` file:

	Note: If your Fuchsia source code is not located in the `~/fuchsia`
	directory, replace `~/fuchsia` with your Fuchsia directory.

	```sh
	export PATH=~/fuchsia/.jiri_root/bin:$PATH
	source ~/fuchsia/scripts/fx-env.sh
	```

	1. Save the file and exit the text editor.

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

	```posix-terminal
	source ~/.bash_profile
	```

	1. Verify that you can run the following commands inside your
	`fuchsia` directory without error:

	```posix-terminal
	jiri help
	```

	```posix-terminal
	fx help
	```

	## 5. Configure firewall rules (Optional) {#configure-firewall-rules}

	Note: This step is not required for building or running Fuchsia. But it is
	recommended to ensure that Fuchsia's emulator instances run smoothly on Linux.

	(Linux only) If you're planning on running Fuchsia on Linux, it is advised to
	run the following command to allow Fuchsia-specific traffic on the host machine:

	```posix-terminal
	fx setup-ufw
	```

	This script requires `sudo` (which asks for your password) to set the appropriate
	firewall rules. (For more information on this script, see [`setup-ufw`][setup-ufw].)

	## Next steps

	To build your first Fuchsia system image, see
	[Configure and build Fuchsia](/docs/get-started/build_fuchsia.md).

	## Appendices

	### Authentication error {#authentication-error}

	If you see the `Invalid authentication credentials` error during the bootstrap
	process, your `~/.gitcookies` file may contain cookies from some repositories in
	`googlesource.com` 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 {#work-on-fuchsia-without-updating-your-path}

	The following sections provide alternative approaches to the
	[Set up environment variables](#set-up-environment-variables) section:

	* [Copy the tool to your binary directory](#copy-the-tool-to-your-binary-directory)
	* [Add a symlink to your binary directory](#add-a-symlink-to-your-binary-directory)

	#### Copy the tool to your binary directory {#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:

	Note: If your Fuchsia source code is not located in the `~/fuchsia` directory,
	replace `~/fuchsia` with your Fuchsia directory.

	```posix-terminal
	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.

	#### Add a symlink to your binary directory {#add-a-symlink-to-your-binary-directory}

	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:

	Note: If your Fuchsia source code is not located in the `~/fuchsia` directory,
	replace `~/fuchsia` with your Fuchsia directory.

	```posix-terminal
	ln -s ~/fuchsia/scripts/fx ~/bin
	```

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

	```posix-terminal
	./scripts/fx help
	```

	In either case, you need `jiri` in your `PATH`.

	<!-- Reference links -->

	[ffx-platform-preflight]: https://fuchsia.dev/reference/tools/sdk/ffx#preflight
	[nano]: https://www.nano-editor.org/docs.php
	[setup-ufw]: https://fuchsia.dev/reference/tools/fx/cmd/setup-ufw