问题描述
git pull --help 说:
在默认模式下，git pull 是 git fetch 后跟 git merge FETCH_HEAD 的简写.
这个 FETCH_HEAD 是什么以及在 git pull 期间实际合并了什么?
What is this FETCH_HEAD and what is actually merged during git pull?
推荐答案
FETCH_HEAD 是一个短期引用，用于跟踪刚刚从远程存储库中获取的内容.git pull 首先调用git fetch，一般情况下是从远程获取一个分支；FETCH_HEAD 指向这个分支的顶端(它存储提交的 SHA1，就像分支一样).git pull 然后调用 git merge，将 FETCH_HEAD 合并到当前分支中.
FETCH_HEAD is a short-lived ref, to keep track of what has just been fetched from the remote repository. git pull first invokes git fetch, in normal cases fetching a branch from the remote; FETCH_HEAD points to the tip of this branch (it stores the SHA1 of the commit, just as branches do). git pull then invokes git merge, merging FETCH_HEAD into the current branch.
结果正是您所期望的:适当远程分支尖端的提交合并到当前分支尖端的提交中.
The result is exactly what you'd expect: the commit at the tip of the appropriate remote branch is merged into the commit at the tip of your current branch.
这有点像不带参数执行git fetch(或git remote update)，更新所有远程分支，然后运行git merge origin/<branch>，但在内部使用 FETCH_HEAD 来引用获取的任何单个引用，而不是需要命名.
This is a bit like doing git fetch without arguments (or git remote update), updating all your remote branches, then running git merge origin/<branch>, but using FETCH_HEAD internally instead to refer to whatever single ref was fetched, instead of needing to name things.
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