问题描述
即使HEAD对于Git分支的名称来说绝对是一个糟糕的选择，它仍然是一个有效的分支名称。如果你碰巧有一个名为HEAD的分支，有没有办法明确地引用实际的 HEAD 符号引用？ 该分支可以被引用为 refs / heads / HEAD ，但是 HEAD 本身怎么样？
使用 HEAD 导致 refname'HEAD'含糊不清在任何以< commit> 作为参数传递的地方发生错误。
根据，如果 HEAD 和 refs / heads / HEAD 存在，所选修订为 HEAD （即不是名为 HEAD 的分支）。
这实际上是大多数的情况下，但 git checkout 更喜欢修订的分支名称，所以 git checkout HEAD 解决分支，而不是当前提交。
还有其他命令也可以选择分支名称，例如 git branch -f HEAD newrev 或 git分支-D HEAD 引用分支，但在这里没有真正的模糊空间： git branch 是明显地在分支上工作。
其他处理程序通常会将分支名称或修订说明符传递给 git rev -parse 或 git rev-list ，这些行为与。
请注意，类似的情况可能会发生在更现实的分支名。就在昨天，我创建了一个处理某些以太网项目的分支，并将分支命名为 e1000 ...，它看起来像一个缩写的SHA-1。名为 facade的分支遭受同样的命运。
Even though "HEAD" is definitely a poor choice for the name of a Git branch, it is still a valid branch name. If you happen to have branch named "HEAD", is there a way how to unambiguously refer to the actual HEAD symbolic reference?
The branch can be referenced as refs/heads/HEAD, but what about the HEAD itself?
Using just HEAD results in an refname 'HEAD' is ambiguous error anywhere where a <commit> is passed as an argument.
According to gitrevisions, if both HEAD and refs/heads/HEAD exist, the selected revision is HEAD (i.e., not the branch named HEAD).
This is in fact the correct answer for most situations, but git checkout prefers the branch-name to the revision, so git checkout HEAD resolves to the branch, rather than the current commit.
There are other commands that also choose the branch name, e.g., git branch -f HEAD newrev or git branch -D HEAD refers to the branch, but here there's no real room for ambiguity: git branch is obviously going to work on the branch.
Other handlers generally pass a branch name or a revision specifier to git rev-parse or git rev-list, and those behave as documented in gitrevisions.
Note that similar cases can occur with more realistic branch names. Just yesterday I created a branch for dealing with a certain ethernet items, and named the branch e1000 ... which looks like an abbreviated SHA-1. A branch named facade suffers the same fate.
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