git 相关

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　　1 下载github 上，主分支以外的其他分支
　　"checkout" the remote branch as a new local branch, and specify a new local branch name.
git checkout -b newlocalbranchname origin/branch-name　　Or you can do:
git checkout -t origin/branch-name　　The latter will create a branch that is also set to track the remote branch.
　　2 ubuntu下载android 源码时，出现错误：Received HTTP code 503 from proxy after CONNECT
　　解决方案：
unset HTTP_PROXY　　
unset HTTPS_PROXY
　　
git config --global --unset http.proxy
　　
git config --global --unset https.proxy
　　
git clone http://yourUser@stashAddress:stashPort/apptest.git
　　To define proxies again:
export HTTP_PROXY=proxyaddress:port　　
export HTTPS_PROXY=proxyaddress:port
　　
git config --global http.proxy http://proxyaddress:port
　　
git config --global https.proxy http://proxyaddress:port
　　3 更改项目下所有分支：
　　repo start preview2 refs/tags/android-o-preview-2 --all
　　
　　repo start oreo-cts-release remotes/aosp/oreo-cts-release  --all
　　一次把所有project都切換到別的branch
　　repo forall -c git checkout [BRANCH_NAME]
　　４　列出所有远程分支tag
　　git ls-remote --tags
　　5 repo init 下载代码时，503 error, and ping 8.8.8.8 or ping goole.com unknown host :

• 　　Edit /etc/network/interfaces:
  sudo nano /etc/network/interfaces
  
• 　　Below iface eth0 inet static add the following line:
  dns-nameservers 8.8.8.8 8.8.4.4　　This will use Google's DNS servers.
  
• 　　Restart your network:
  sudo /etc/init.d/networking restart
  

　　6 repo sync 下错分支怎么办：
　　If you run repo init a second time with a different branch, you can simply repo sync and it will not download the entire source code again.
　　７　add git log to files:　保存git 提交log到文件中
　　git log --after="2017-6-30" > log_630.txt
　　參考：https://www.atlassian.com/git/tutorials/git-log
　　８