为什么checkout -b仅在第二次尝试后才能正常工作？ [英] Why checkout -b does work only after second attempt?

问题描述

$sudo git clone sample.git 

Cloning into 'sample'...
warning: You appear to have cloned an empty repository.
done.

$ cd sample

$ echo "hello world" > readme

$ git add readme

$ git checkout -b a
Switched to a new branch 'a'

$ git branch

$ git checkout master
error: pathspec 'master' did not match any file(s) known to git.

$ git checkout a
error: pathspec 'a' did not match any file(s) known to git.

$ git checkout -b b
Switched to a new branch 'b'

$ git branch

$ git commit -am .
[b (root-commit) 12b8434] .
 1 file changed, 1 insertion(+)
 create mode 100644 go

$ git branch
* b

$ git checkout a
error: pathspec 'a' did not match any file(s) known to git.

$ git checkout -b a
Switched to a new branch 'a'

$ git branch
* a
  b

我的第一个结帐-ba 有什么问题，为什么分支未创建？

What was wrong with my first checkout -b a, why the branch was not created?

推荐答案

好的，您告诉 git 来创建一个空仓库中的分支。还没有提交，分支只是一个指向提交的粘滞便笺。那么，什么是 git 应该做...

Well, you told git to create a branch in an empty repository. There is no commit yet, and a branch is just a "sticky note" pointing to a commit. So what is git supposed to do...

至少它将您的新分支存储在 HEAD ，所以分支提示将被更新为将来的提交。如您的提交所示。

At least it stores your new branch in HEAD, so the branch tip will be updated with future commits. As shown by your commit.

更多有趣的空白存储库：

More fun with empty repositories:

~/tmp> mkdir empty
~/tmp> cd empty
~/tmp/empty> git init
Initialized empty Git repository in tmp/empty/.git/
~/tmp/empty> git log
fatal: bad default revision 'HEAD'
~/tmp/empty> git branch xxx
fatal: Not a valid object name: 'master'.
~/tmp/empty> git checkout -b xxx
Switched to a new branch 'xxx'
~/tmp/empty> git log
fatal: bad default revision 'HEAD'
~/tmp/empty> ls -l .git/
branches/    config       description  HEAD         hooks/       info/        objects/     refs/
~/tmp/empty> cat .git/HEAD
ref: refs/heads/xxx
~/tmp/empty> ls -l .git/refs/heads
total 0

编辑： @ jthill。

adopted the comment from @jthill.

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