Downloading the Source Tree
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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, seeVersion Control.
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 https://dl-ssl.google.com/dl/googlesource/git-repo/repo > ~/bin/repo$ chmod a+x ~/bin/repo
For version 1.17, the SHA-1 checksum for repo is ddd79b6d5a7807e911b524cb223bc3544b661c28
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. If you're using MacOS, this has to be on a case-sensitive filesystem. Give it any name you like:
$ 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 https://android.googlesource.com/platform/manifest
To check out a branch other than "master", specify it with -b:
$ repo init -u https://android.googlesource.com/platform/manifest -b android-4.0.1_r1
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 aregistered Google account. 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 directoryunder their project names. The initial sync operation will takean hour or more to complete. For more aboutrepo sync
and otherRepo commands, see Version Control.
Using authentication
By default, access to the Android source code is anonymous. To protect theservers against excessive usage, each IP address is associated with a quota.
When sharing an IP address with other users (e.g. when accessing the sourcerepositories from beyond a NAT firewall), the quotas can trigger even forregular usage patterns (e.g. if many users sync new clients from the same IPaddress within a short period).
In that case, it is possible to use authenticated access, which then usesa separate quota for each user, regardless of the IP address.
The first step is to create a password fromthe password generator andto save it in~/.netrc
according to the instructions on that page.
The second step is to force authenticated access, by using the followingmanifest URI:https://android.googlesource.com/a/platform/manifest
. Noticehow the /a/
directory prefix triggers mandatory authentication. You canconvert an existing client to use mandatory authentication with the followingcommand:
$ repo init -u https://android.googlesource.com/a/platform/manifest
Troubleshooting network issues
When downloading from behind a proxy (which is common in somecorporate environments), it might be necessary to explicitlyspecify the proxy that is then used by repo:
$ export HTTP_PROXY=http://<proxy_user_id>:<proxy_password>@<proxy_server>:<proxy_port>$ export HTTPS_PROXY=http://<proxy_user_id>:<proxy_password>@<proxy_server>:<proxy_port>
More rarely, Linux clients experience connectivity issues, gettingstuck in the middle of downloads (typically during "Receiving objects").It has been reported that tweaking the settings of the TCP/IP stack andusing non-parallel commands can improve the situation. You need rootaccess to modify the TCP setting:
$ sudo sysctl -w net.ipv4.tcp_window_scaling=0$ repo sync -j1
Using a local mirror
When using several clients, especially in situations where bandwidth is scarce,it is better to create a local mirror of the entire server content, and tosync clients from that mirror (which requires no network access). The downloadfor a full mirror is smaller than the download of two clients, while containingmore information.
These instructions assume that the mirror is created in /usr/local/aosp/mirror
.The first step is to create and sync the mirror itself, which uses close to13GB of network bandwidth and a similar amount of disk space. Notice the--mirror
flag, which can only be specified when creating a new client:
$ mkdir -p /usr/local/aosp/mirror$ cd /usr/local/aosp/mirror$ repo init -u https://android.googlesource.com/mirror/manifest --mirror$ repo sync
Once the mirror is synced, new clients can be created from it. Note that it'simportant to specify an absolute path:
$ mkdir -p /usr/local/aosp/master$ cd /usr/local/aosp/master$ repo init -u /usr/local/aosp/mirror/platform/manifest.git$ repo sync
Finally, to sync a client against the server, the mirror needs to be syncedagainst the server, then the client against the mirror:
$ cd /usr/local/aosp/mirror$ repo sync$ cd /usr/local/aosp/master$ repo sync
It's possible to store the mirror on a LAN server and to access it overNFS, SSH or Git. It's also possible to store it on a removable drive andto pass that drive around between users or between machines.
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)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Wi5D-----END PGP PUBLIC KEY BLOCK-----
After importing the keys, you can verify any tag with
$ git tag -v TAG_NAME
If you haven't set up ccache yet,now would be a good time to do it.
Next: Build the code
You now have a complete local copy of the Android codebase. Continue on to building....
地址:http://source.android.com/source/downloading.html
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