src/source/downloading.md

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# Downloading the Source Tree #

## Installing Repo ##

Repo is a tool that makes it easier to work with Git in the context of Android. For more information about Repo, see [Version Control](version-control.html).

To install, initialize, and configure Repo, follow these steps:

 - Make sure you have a bin/ directory in your home directory, and that it is included in your path:

        $ mkdir ~/bin
        $ PATH=~/bin:$PATH

 - Download the Repo script and ensure it is executable:

        $ curl http://android.git.kernel.org/repo > ~/bin/repo
        $ chmod a+x ~/bin/repo


## Initializing a Repo client ##

After installing Repo, set up your client to access the android source repository:

 - Create an empty directory to hold your working files:

        $ mkdir WORKING_DIRECTORY
        $ cd WORKING_DIRECTORY

 - Run `repo init` to bring down the latest version of Repo with all its most recent bug fixes.  You must specify a URL for the manifest, which specifies where the various repositories included in the Android source will be placed within your working directory.

        $ repo init -u git://android.git.kernel.org/platform/manifest.git

    To check out a branch other than "master", specify it with -b:

        $ repo init -u git://android.git.kernel.org/platform/manifest.git -b froyo

 - When prompted, please configure Repo with your real name and email address.  To use the Gerrit code-review tool, you will need an email address that is connected with a [registered Google account](http://www.google.com/accounts).  Make sure this is a live address at which you can receive messages.  The name that you provide here will show up in attributions for your code submissions.

A successful initialization will end with a message stating that Repo is initialized in your working directory.  Your client directory should now contain a `.repo` directory where files such as the manifest will be kept.



## Getting the files ##

To pull down files to your working directory from the repositories as specified in the default manifest, run

    $ repo sync

The Android source files will be located in your working directory under their project names.  The initial sync operation will take several minutes to complete.  For more about `repo sync` and other Repo commands, see [Version Control](version-control.html).


## Verifying Git Tags ##

Load the following public key into your GnuPG key database. The key is used to sign annotated tags that represent releases.

    $ gpg --import

Copy and paste the key(s) below, then enter EOF (Ctrl-D) to end the input and process the keys.

        -----BEGIN PGP PUBLIC KEY BLOCK-----
        Version: GnuPG v1.4.2.2 (GNU/Linux)  
        mQGiBEnnWD4RBACt9/h4v9xnnGDou13y3dvOx6/t43LPPIxeJ8eX9WB+8LLuROSV
        lFhpHawsVAcFlmi7f7jdSRF+OvtZL9ShPKdLfwBJMNkU66/TZmPewS4m782ndtw7
        8tR1cXb197Ob8kOfQB3A9yk2XZ4ei4ZC3i6wVdqHLRxABdncwu5hOF9KXwCgkxMD
        u4PVgChaAJzTYJ1EG+UYBIUEAJmfearb0qRAN7dEoff0FeXsEaUA6U90sEoVks0Z
        wNj96SA8BL+a1OoEUUfpMhiHyLuQSftxisJxTh+2QclzDviDyaTrkANjdYY7p2cq
        /HMdOY7LJlHaqtXmZxXjjtw5Uc2QG8UY8aziU3IE9nTjSwCXeJnuyvoizl9/I1S5
        jU5SA/9WwIps4SC84ielIXiGWEqq6i6/sk4I9q1YemZF2XVVKnmI1F4iCMtNKsR4
        MGSa1gA8s4iQbsKNWPgp7M3a51JCVCu6l/8zTpA+uUGapw4tWCp4o0dpIvDPBEa9
        b/aF/ygcR8mh5hgUfpF9IpXdknOsbKCvM9lSSfRciETykZc4wrRCVGhlIEFuZHJv
        aWQgT3BlbiBTb3VyY2UgUHJvamVjdCA8aW5pdGlhbC1jb250cmlidXRpb25AYW5k
        cm9pZC5jb20+iGAEExECACAFAknnWD4CGwMGCwkIBwMCBBUCCAMEFgIDAQIeAQIX
        gAAKCRDorT+BmrEOeNr+AJ42Xy6tEW7r3KzrJxnRX8mij9z8tgCdFfQYiHpYngkI
        2t09Ed+9Bm4gmEO5Ag0ESedYRBAIAKVW1JcMBWvV/0Bo9WiByJ9WJ5swMN36/vAl
        QN4mWRhfzDOk/Rosdb0csAO/l8Kz0gKQPOfObtyYjvI8JMC3rmi+LIvSUT9806Up
        hisyEmmHv6U8gUb/xHLIanXGxwhYzjgeuAXVCsv+EvoPIHbY4L/KvP5x+oCJIDbk
        C2b1TvVk9PryzmE4BPIQL/NtgR1oLWm/uWR9zRUFtBnE411aMAN3qnAHBBMZzKMX
        LWBGWE0znfRrnczI5p49i2YZJAjyX1P2WzmScK49CV82dzLo71MnrF6fj+Udtb5+
        OgTg7Cow+8PRaTkJEW5Y2JIZpnRUq0CYxAmHYX79EMKHDSThf/8AAwUIAJPWsB/M
        pK+KMs/s3r6nJrnYLTfdZhtmQXimpoDMJg1zxmL8UfNUKiQZ6esoAWtDgpqt7Y7s
        KZ8laHRARonte394hidZzM5nb6hQvpPjt2OlPRsyqVxw4c/KsjADtAuKW9/d8phb
        N8bTyOJo856qg4oOEzKG9eeF7oaZTYBy33BTL0408sEBxiMior6b8LrZrAhkqDjA
        vUXRwm/fFKgpsOysxC6xi553CxBUCH2omNV6Ka1LNMwzSp9ILz8jEGqmUtkBszwo
        G1S8fXgE0Lq3cdDM/GJ4QXP/p6LiwNF99faDMTV3+2SAOGvytOX6KjKVzKOSsfJQ
        hN0DlsIw8hqJc0WISQQYEQIACQUCSedYRAIbDAAKCRDorT+BmrEOeCUOAJ9qmR0l
        EXzeoxcdoafxqf6gZlJZlACgkWF7wi2YLW3Oa+jv2QSTlrx4KLM=
        =Wi5D 
        -----END PGP PUBLIC KEY BLOCK-----

After importing the keys, you can verify any tag with 
    
    $ git tag -v TAG_NAME


# Next: Build the code #

You now have a complete local copy of the Android codebase.  Continue on to [building](building.html)....