为什么是"git branch"?在新存储库中保持沉默? [英] Why is "git branch" silent in new repositories?

问题描述

创建新的存储库并运行git branch时，它会静默退出.例如:

When you create a new repository and run git branch, it exits silently. For example:

$ mkdir /tmp/foo; cd /tmp/foo; git init
Initialized empty Git repository in /tmp/foo/.git/

$ git branch

该命令为什么不提供任何输出或不显示master分支?

Why doesn't the command provide any output, or show the master branch?

推荐答案

TL; DR

尚无分支头.

TL;DR

No branch heads exist yet.

在您第一次提交之前，Git存储库没有分支.新初始化的存储库将HEAD设置为refs/heads/master，但是在进行第一次提交之前，refs/heads/master不会存在或包含提交指针.

A Git repository has no branches until you make your first commit. A newly-initialized repository sets HEAD to refs/heads/master, but refs/heads/master won't exist or contain a commit pointer until after the first commit is made.

在提交期间，Git取消引用symbolic-ref HEAD来查找当前分支的头，然后使用git-commit-tree提供的提交哈希更新该头.

During a commit, Git dereferences the symbolic-ref HEAD to find the head of the current branch, and then updates that head with the commit hash supplied by git-commit-tree.

最终结果是，git branch在新存储库中没有任何要报告的内容.没有分支头，它只是以退出状态为零静默终止.

The end result is that git branch has nothing to report in a new repository. With no branch heads present, it simply terminates silently with an exit status of zero.

• git-branch(1)
• git-commit-tree(1)
• git-symbolic-ref(1).
• git-update-ref(1)
• gitcore-tutorial(7)

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