Installing Newt on Mac OS
-------------------------

Newt is supported on Mac OS X 64 bit platforms and has been tested on
Mac OS 10.10 and higher.

This page shows you how to:

-  Upgrade to or install the latest release version of newt.
-  Install the latest newt from the master branch (unstable).

See :doc:`prev_releases` to install an earlier version of newt.

**Note:** If you would like to contribute to the newt tool, see :doc:`Setting Up Go Environment to Contribute
to Newt and Newtmgr Tools <../../misc/go_env>`.

Installing Homebrew
~~~~~~~~~~~~~~~~~~~

If you do not have Homebrew installed, run the following command. You
will be prompted for your sudo password.

.. code-block:: console

    $ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

You can also extract (or ``git clone``) Homebrew and install it to
/usr/local.

Adding the Mynewt Homebrew Tap
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

If this is your first time installing newt, add the
**runtimeco/homebrew-mynewt** tap:

.. code-block:: console

    $ brew tap runtimeco/homebrew-mynewt
    $ brew update

Upgrading to or Installing the Latest Release Version
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Perform the following to upgrade or install the latest release version
of newt.

Upgrading to the Latest Release Version of Newt
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

If you previously installed newt using brew, run the following
commands to upgrade to newt latest:

.. code-block:: console

    $ brew update
    $ brew upgrade mynewt-newt
    ==> Upgrading 1 outdated package, with result:
    runtimeco/mynewt/mynewt-newt 1.4.1
    ==> Upgrading runtimeco/mynewt/mynewt-newt
    ==> Downloading https://github.com/runtimeco/binary-releases/raw/master/mynewt-newt-tools_1.4.1/mynewt-newt-1.4.1.sierra.bottle.tar.gz
    ==> Downloading from https://raw.githubusercontent.com/runtimeco/binary-releases/master/mynewt-newt-tools_1.4.1/mynewt-newt-1.4.1.sierra.bottle.tar.gz
    ######################################################################## 100.0%
    ==> Pouring mynewt-newt-1.4.1.sierra.bottle.tar.gz
    🍺  /usr/local/Cellar/mynewt-newt/1.4.1: 3 files, 7.9MB

Installing the Latest Release Version of Newt
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Run the following command to install the latest release version of newt:

.. code-block:: console

    $ brew update
    $ brew install mynewt-newt
    ==> Installing mynewt-newt from runtimeco/mynewt
    ==> Downloading https://github.com/runtimeco/binary-releases/raw/master/mynewt-newt-tools_1.4.1/mynewt-newt-1.4.1.sierra.bottle.tar.gz
    Already downloaded: /Users/gavin/Library/Caches/Homebrew/mynewt-newt-1.4.1.sierra.bottle.tar.gz
    ==> Pouring mynewt-newt-1.4.1.sierra.bottle.tar.gz
    🍺  /usr/local/Cellar/mynewt-newt/1.4.1: 3 files, 7.9MB

**Notes:** Homebrew bottles for newt are available for Mac OS Sierra. If you are running an earlier version of Mac OS,
the installation will install the latest version of Go and compile newt locally.

Checking the Installed Version
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Check that you are using the installed version of newt:

.. code-block:: console

    $ which newt
    /usr/local/bin/newt
    $ newt version
    Apache Newt version: 1.4.1

**Note:** If you previously built newt from source and the output of
``which newt`` shows
"$GOPATH/bin/newt", you will need to move "$GOPATH/bin" after
"/usr/local/bin" for your PATH in ~/.bash_profile, and source
~/.bash_profile.

Get information about newt:

.. code-block:: console

    $ newt help
    Newt allows you to create your own embedded application based on the Mynewt
    operating system. Newt provides both build and package management in a single
    tool, which allows you to compose an embedded application, and set of
    projects, and then build the necessary artifacts from those projects. For more
    information on the Mynewt operating system, please visit
    https://mynewt.apache.org/.

    Please use the newt help command, and specify the name of the command you want
    help for, for help on how to use a specific command

    Usage:
      newt [flags]
      newt [command]

    Examples:
      newt
      newt help [<command-name>]
        For help on <command-name>.  If not specified, print this message.

    Available Commands:
      build        Build one or more targets
      clean        Delete build artifacts for one or more targets
      create-image Add image header to target binary
      debug        Open debugger session to target
      info         Show project info
      install      Install project dependencies
      load         Load built target to board
      mfg          Manufacturing flash image commands
      new          Create a new project
      pkg          Create and manage packages in the current workspace
      resign-image Re-sign an image.
      run          build/create-image/download/debug <target>
      size         Size of target components
      sync         Synchronize project dependencies
      target       Commands to create, delete, configure, and query targets
      test         Executes unit tests for one or more packages
      upgrade      Upgrade project dependencies
      vals         Display valid values for the specified element type(s)
      version      Display the Newt version number

    Flags:
      -h, --help              Help for newt commands
      -j, --jobs int          Number of concurrent build jobs (default 8)
      -l, --loglevel string   Log level (default "WARN")
      -o, --outfile string    Filename to tee output to
      -q, --quiet             Be quiet; only display error output
      -s, --silent            Be silent; don't output anything
      -v, --verbose           Enable verbose output when executing commands

    Use "newt [command] --help" for more information about a command.

Installing Newt from the Master Branch
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We recommend that you use the latest release version of newt. If
you would like to use the master branch with the latest updates, you can
install newt from the HEAD of the master branch.

**Notes:**

-  The master branch may be unstable.
-  This installation will install the latest version of Go on your
   computer, if it is not installed, and compile newt locally.

If you previously installed newt using brew, unlink the current
version:

.. code-block:: console

    $ brew unlink mynewt-newt

Install the latest unstable version of newt from the master branch:

.. code-block:: console

    $ brew install mynewt-newt --HEAD

To switch back to the latest stable release version of newt,
you can run:

.. code-block:: console

    $ brew switch mynewt-newt 1.4.1