问题：git clone无法获取代码
~/Desktop$ git clone xxx
Cloning into 'xxx'...
remote: Counting objects: 670, done
remote: Finding sources: 100% (670/670)
remote: Total 670 (delta 312), reused 666 (delta 312)
Receiving objects: 100% (670/670), 39.90 MiB | 11.20 MiB/s, done.
Resolving deltas: 100% (312/312), done.
Checking connectivity... done.
warning: remote HEAD refers to nonexistent ref, unable to checkout.
分析：$git branch -a
remotes/origin/branch-name
发现没有master而有其它分支branch-name，由于git clone默认获取master分支code，故需要在pull时指定分支branch-name
解决办法：
git pull origin branch-name
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