git 如何将分支的内容复制到新的本地分支？
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How can I copy the content of a branch to a new local branch?
提问by serengeti12
I have worked on a local branch and also pushed the changes to remote. I want to revert the changes on that branch and do something else on it, but I don't want to lose the work completely. I was thinking of something like create a new branch locally and copy the old branch there, then I can revert the changes and continue working on the old branch. Is there a better way maybe? Or how do I do this?
我曾在本地分支工作，并将更改推送到远程。我想恢复该分支上的更改并对其进行其他操作，但我不想完全失去工作。我正在考虑在本地创建一个新分支并在那里复制旧分支，然后我可以恢复更改并继续在旧分支上工作。也许有更好的方法？或者我该怎么做？
回答by Daniel Hilgarth
git checkout old_branch
git branch new_branch
This will give you a new branch "new_branch" with the same state as "old_branch".
这将为您提供一个与“old_branch”具有相同状态的新分支“new_branch”。
This command can be combined to the following:
此命令可以组合为以下内容：
git checkout -b new_branch old_branch
回答by Lyle Z
git branch copyOfMyBranch MyBranch
This avoids the potentially time-consuming and unnecessary act of checking out a branch. Recall that a checkout modifies the "working tree", which could take a long time if it is large or contains large files (images or videos, for example).
这避免了检查分支的潜在耗时和不必要的操作。回想一下，结帐会修改“工作树”，如果它很大或包含大文件（例如图像或视频），这可能需要很长时间。
回答by VonC
With Git 2.15 (Q4 2017), "git branch" learned "-c/-C" to create a new branch by copying an existing one.
在 Git 2.15（2017 年第 4 季度）中，“ git branch”学会了“ -c/-C”通过复制现有分支来创建新分支。
See commit c8b2cec(18 Jun 2017) by ?var Arnfj?re Bjarmason (avar).
See commit 52d59cc, commit 5463caa(18 Jun 2017) by Sahil Dua (sahildua2305).
(Merged by Junio C Hamano -- gitster--in commit 3b48045, 03 Oct 2017)
请参阅?var Arnfj?re Bjarmason ( )提交的 c8b2cec（2017 年 6 月 18 日）。
请参阅Sahil Dua ( ) 的commit 52d59cc和commit 5463caa（2017 年 6 月 18 日）。（由Junio C Hamano合并-- --在commit 3b48045，2017 年 10 月 3 日）avarsahildua2305gitster
branch: add a--copy(-c) option to go with--move(-m)Add the ability to
--copya branch and its reflog and configuration, this uses the same underlying machinery as the--move(-m) option except the reflog and configuration is copied instead of being moved.This is useful for e.g. copying a topic branch to a new version, e.g.
worktowork-2after submitting theworktopic to the list, while preserving all the tracking info and other configuration that goes with the branch, and unlike--movekeeping the other already-submitted branch around for reference.
branch: 添加一个--copy(-c) 选项来搭配--move(-m)向
--copy分支及其引用日志和配置添加功能，这使用与--move(-m) 选项相同的底层机制，除了引用日志和配置被复制而不是被移动。这是例如复制一个话题分支到一个新的版本，例如，有用
work到work-2提交后work的话题列表，同时保留所有与分支而来的跟踪信息和其他配置，而不像--move保持其他已提交的分支周围参考。
Note: when copying a branch, you remain on your current branch.
As Junio C Hamano explains:
注意：复制分支时，您将保留在当前分支上。
正如 Junio C Hamano 解释的那样：
When creating a new branch
Bby copying the branchAthat happens to be the current branch, it also updatesHEADto point at the new branch.
It probably was made this way because "git branch -c A B" piggybacked its implementation on "git branch -m A B",This does not match the usual expectation.
If I were sitting on a blue chair, and somebody comes and repaints it to red, I would accept ending up sitting on a chair that is now red (I am also OK to stand, instead, as there no longer is my favourite blue chair).But if somebody creates a new red chair, modelling it after the blue chair I am sitting on, I do not expect to be booted off of the blue chair and ending up on sitting on the new red one.
B通过复制A恰好是当前分支的分支来创建新分支时，它也会更新HEAD以指向新分支。
它可能是这样制作的，因为“git branch -c A B”在“git branch -m A B”上搭载了它的实现，这与通常的期望不符。
如果我坐在一张蓝色椅子上，有人来把它重新漆成红色，我会接受最终坐在一张现在是红色的椅子上（我也可以站着，因为不再有我最喜欢的蓝色椅子了）。但是，如果有人创造了一把新的红色椅子，以我所坐的蓝色椅子为模型进行建模，我不希望被从蓝色椅子上踢下来并最终坐在新的红色椅子上。
