已经下载了Android源码，但是现在需要想更新，便可以直接使用repo sync同步到本地。

可能会出现如下错误：

 repo sync

remote: Counting objects: 10, done.

remote: Compressing objects: 100% (4/4), done.

remote: Total 6 (delta 2), reused 6 (delta 2)

Unpacking objects: 100% (6/6), done.

From git://github.com/richi-chen/Pandaboard-ICS-repo

   3ea7f09..11ecd6d  master     -> origin/master

   534d620..5fa74f5  omapzoom   -> origin/omapzoom

 

 

 solution:

to recover any uncommitted change, you should use 'git stash' and 'git clean -f -d'

for example: if you find it say there are uncommitted changes in .repo/manifests, you shoud 'cd .repo/manifests' and then 'git stash', 'git clean -f -d'