如何检测在LibGit2Sharp中创建了哪个分支 [英] How to detect what commit a branch has been created from in LibGit2Sharp

问题描述

因此，给定一个LibGit2Sharp 分支的实例，你如何计算它最初创建的提交内容？

c <分支 c>仅仅是描述git 头部引用的对象。 头是一个文本文件，主要位于 .git / refs / heads 层次结构下。这个文本文件包含当前指向的 commit 这个头部的散列。类似地，分支带有 Tip 属性，它指向 Commit c>。

使用git存储库并执行诸如提交，重置，重新绑定等操作时，头文件用不同的散列更新，指向不同的提交。

头提交。 分支。

使用git创建新分支时，会创建一个新的reflog。

给定一个现有的分支 backup c $ c



  $ cat .git / refs / heads / backup 
 7dec18258252769d99a4ec9c82225e47d58f958c 
  

创建一个新分支将创建并提供它的reflog

  $ git分支new_branch_from_branch备份
 
 $ git reflog new_branch_from_branch 
 7dec182 new_branch_from_branch @ {0}：分支：从备份创建
  

当然，直接从提交创建分支时也可行

  $ git分支new_branch_from_sha 191adce 
 
 $ git reflog new_branch_from_sha 
 191adce new_branch_from_sha @ {0}：分支：创建自191adce 
  



LibGit2Sharp也公开reflog。例如，以下代码将枚举特定分支的日志条目。

  var branch = repository.Head; //或repository.Branches [my_branch] ... 
 
 foreach（ReflogEntry e in repository.Refs.Log（branch.CanonicalName））
 {
 Console.WriteLine （{0}  -  {1}：{2}，
 e.From.ToString（7），e.To.ToString（7），e.Message）; 
 
 
 
 
 
 $ b因此好消息 ，reflog可能包含你所追求的;  - ）
 
 
但是...  
 
 
 
 
您必须通过在每条消息中搜索分支：从模式
创建正确的条目
 
如果您的分支太旧了，reflog中较旧的条目可能已被内置  git gc  管家流程（默认情况下，reflog条目保留90天），并且现在可能会丢失最初的创建自条目
 
 
 
 
 
 注意：截至今天，LibGit2Sharp不会在创建或移除分支时创建条目。但是，目前正在通过 @dahlbyk  作为 拉取请求＃499   
 
So given an instance of LibGit2Sharp Branch how do you work out what commit that it was initially created from?
解决方案
A Branch is merely an object depicting a git head reference. A head is a text file, mostly living under the .git/refs/heads hierarchy. This text file contains the hash of the commit this head currently points to. Similarly, a Branch bears a Tip property which points to a Commit.

When working with git repositories and performing actions such as committing, resetting, rebasing... the head file is updated with different hashes, pointing to different commits.

A head keeps no track of previous pointed at commits. Neither does the Branch.

With git, when creating a new branch, a new reflog is created. Git takes care of adding a first entry with a message identifying the object the branch has been created from.

Given an existing branch backup
$ cat .git/refs/heads/backup
7dec18258252769d99a4ec9c82225e47d58f958c
Creating a new branch will create and feed its reflog
$ git branch new_branch_from_branch backup

$ git reflog new_branch_from_branch
7dec182 new_branch_from_branch@{0}: branch: Created from backup
Of course, that also works when directly creating a branch from a commit
$ git branch new_branch_from_sha 191adce

$ git reflog new_branch_from_sha
191adce new_branch_from_sha@{0}: branch: Created from 191adce
LibGit2Sharp exposes the reflog as well. For instance, the following code will enumerate the log entries for a specific Branch.
var branch = repository.Head; // or repository.Branches["my_branch"]...

foreach (ReflogEntry e in repository.Refs.Log(branch.CanonicalName))
{
    Console.WriteLine("{0} - {1} : {2}",
        e.From.ToString(7), e.To.ToString(7), e.Message);
}




So "good news", the reflog may contain what you're after ;-)

but...


you'll have to find out the correct entry by yourself by searching within each message the "branch: Created from" pattern
If your branch is too old, older entries in the reflog may have been removed by the built-in git gc housekeeping process (by default reflog entries are kept for 90 days) and the initial "Created from" entry may now be lost


Note: As of today, LibGit2Sharp doesn't create an entry when creating or removing a branch. However, this is currently tackled by the amazing @dahlbyk as part of Pull Request #499

                        
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