我在Git中创建了一个新分支：
git branch my_branch
推动它：
git push origin my_branch
现在假设有人在服务器上做了一些更改，我想从origin/my_branch中提取。我愿意：
git pull
但我得到：
You asked me to pull without telling me which branch you
want to merge with, and 'branch.my_branch.merge' in
your configuration file does not tell me, either. Please
specify which branch you want to use on the command line and
try again (e.g. 'git pull <repository> <refspec>').
See git-pull(1) for details.
If you often merge with the same branch, you may want to
use something like the following in your configuration file:
[branch "my_branch"]
remote = <nickname>
merge = <remote-ref>
[remote "<nickname>"]
url = <url>
fetch = <refspec>
See git-config(1) for details.
我了解到，我可以通过以下方式实现：
git branch --set-upstream my_branch origin/my_branch
但为什么我需要为我创建的每个分支都这样做？如果我将my_branch推到origin/my_branch，那么我会想将origin/mi_branch拉到my_brance，这不是很明显吗？如何将此设置为默认行为？
这里有很多很好的答案，然而，所有这些都要求您在运行git pull之前正确地执行其他操作
使用别名来完成诸如“通过创建本地正在正确跟踪的远程分支，使git push按应有的方式工作”之类的工作当然会有所帮助。然而，当你忘记使用它们，或者经历了不同的工作流程时，这些都不会对你有所帮助。
这里有一个bash函数，您可以使用它来按应该的方式进行拉取，方法是检测何时未配置远程合并目标，但远程上有一个与本地分支同名的分支，然后将该分支设置为合并目标，然后进行拉取。
git-pulldown() {
head="$(git rev-parse --abbrev-ref HEAD)"
if [[ $(git config "branch.$head.merge") ]]; then #there's already a merge target configured, just pull as normal from there
git pull
else
if [[ $(git ls-remote --heads origin $head) ]]; then #there is an upstream branch existing with the same name as our branch
git branch --set-upstream-to origin/$head #set merge target to upstream branch with same name
git pull
else #fail with explanation
echo "Branch $head has no upstream or merge target! You will likely have to push first, or manually configure it"
return 1
fi
fi
}
您可以通过两种方式更简单地设置上游。创建分支时首先：
git branch -u origin/my-branch
或者在创建分支后，可以使用此命令。
git push -u origin my-branch
您还可以在一个命令中分支、检出和设置上游：
git checkout -b my-branch -t origin/my-branch
我个人倾向于使用两步命令：
git checkout -b my-branch
git push -u origin my-branch
