我如何从git存储库中删除旧的历史记录？ [英] How do I remove the old history from a git repository?

问题描述

我有一个拥有大量历史的git仓库：500多个分支，500个+标签，回到2007年年中。它包含约19,500次提交。我们希望在2010年1月1日之前删除所有历史记录，以使其更小并且更容易处理（我们会在归档存储库中保留完整的历史记录副本）。

我知道我希望成为新存储库根目录的提交。然而，我不能找出正确的git mojo来截断回购从那个提交开始。我在猜测一些变体

  git filter-branch 
   
 
 
将是必要的;可能还需要对待我们要分开保存的200多个分支中的每一个，然后将回购补丁一起回收（我知道该怎么做）。
 
 
有没有人做过这样的事情？ 
解决方案
只要创建一个移植过程中你的新根提交给没有父进程（或者提交给一个空的提交，例如你的仓库的真实根提交）。例如。  echo< NEW-ROOT-SHA1> > .git / info / grafts  
 
 
 
创建移植后，立即生效;你应该可以看看 git log ，看看不想要的旧提交已经消失： 
 
 
  $ echo 4a46bc886318679d8b15e05aea40b83ff6c3bd47> .git / info / grafts 
 $ git log --decorate | tail --lines = 11 
 commit cb3da2d4d8c3378919844b29e815bfd5fdc0210c 
作者：Your Name< [e-mail]> 
日期：五月24日14:04:10 2013 +0200 
 
另一个消息
 
 commit 4a46bc886318679d8b15e05aea40b83ff6c3bd47（嫁接）
作者：你的名字< [e-mail]> 
日期：5月23日星期四22:27:48 2013 +0200 
 
某些信息
  
如果一切看起来都像预期的那样，那么你可以做一个简单的 git filter-branch  -  --all 来使它永久。  
 
 
 谨慎：在执行 filter-branch 步骤后，所有提交标识符都会发生更改，所以任何使用旧回购不得与任何使用新回购的人合并。
 
I'm afraid I couldn't find anything quite like this particular scenario.

I have a git repository with a lot of history: 500+ branches, 500+ tags, going back to mid-2007. It contains ~19,500 commits. We'd like to remove all of the history before Jan 1, 2010, to make it smaller and easier to deal with (we would keep a complete copy of the history in an archive repository).

I know the commit that I want to have become the root of the new repository. I can't, however, figure out the correct git mojo to truncate the repo to start with that commit. I'm guessing some variant of 
git filter-branch
involving grafts would be necessary; it might also be necessary to treat each of the 200+ branches we want to keep separately and then patch the repo back together (something I do know how to do).

Has anyone ever done something like this? I've got git 1.7.2.3 if that matters.
解决方案
Just create a graft of the parent of your new root commit to no parent (or to an empty commit, e.g. the real root commit of your repository). E.g. echo "<NEW-ROOT-SHA1>" > .git/info/grafts

After creating the graft, it takes effect right away; you should be able to look at git log and see that the unwanted old commits have gone away:
$ echo 4a46bc886318679d8b15e05aea40b83ff6c3bd47 > .git/info/grafts
$ git log --decorate | tail --lines=11
commit cb3da2d4d8c3378919844b29e815bfd5fdc0210c
Author: Your Name <[e-mail]>
Date:   Fri May 24 14:04:10 2013 +0200

    Another message

commit 4a46bc886318679d8b15e05aea40b83ff6c3bd47 (grafted)
Author: Your Name <[e-mail]>
Date:   Thu May 23 22:27:48 2013 +0200

    Some message
If all looks as intended, you can just do a simple git filter-branch -- --all to make it permanent. 

BEWARE: after doing the filter-branch step, all commit ids will have changed, so anybody using the old repo must never merge with anyone using the new repo.

                        
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