问题描述
我很难理解git-fetch的细微差别。我知道做一个 fetch
,可以将远程引用读取到本地跟踪分支。
我有几个问题不过:
-
有可能本地跟踪分支不存在?如果是这样,它会自动创建吗?
如果我做一个 -
git-fetch的手册页指定:
git-fetch< options> <库> <的Refspec>
fetch
会发生什么,以及指定一个非跟踪分支作为目的地? 我如何使用refspec来获取内容从我的远程主人到其远程追踪分支?我相信这可能是可能的,如果我现在的HEAD是在主,我运行
git fetch origin master
然而,我可以使用< +?src:dest>
refspec来达到同样的效果吗?我认为这会帮助我更好地理解这些概念。
还有一个问题:
我的.git /配置文件有以下几行提取(仅显示相关行):
$ $ p $ fc = fetch = + refs / heads / *:refs /遥控器/原产地/ *
有人可以解释这一行究竟意味着什么吗? $ b
首先,没有这种本地跟踪分支的概念,只有远程跟踪分支。因此 origin / master 是 origin 回购库中 master 的远程跟踪分支。
通常,您会执行 git fetch $ remote 来更新您的所有远程跟踪分支,并在需要时创建新的分支。
然而,您可以还要指定一个refspec,但不会触及你的远程跟踪分支,相反,它会获取你指定的分支并将其保存在FETCH_HEAD上,除非你指定了一个目的地。一般来说,你不想惹这个。
最后,
fetch = + refs / heads / *:refs / remotes / origin / *
如果你这样做的话
$ g $ f $ g $ g $ f $ g
$ b $ $ $ $
$ b
它实际上会做:
git fetch origin + refs / heads / *:refs /遥控器/原产地/ *
这意味着远程 heads / foobar 本地遥控器/原产地/ foobar ,加号表示即使它们不是快进,它们也会更新。 你认为跟踪分支与 git pull 和合并配置有关。
I am having a hard time understanding the nuances of git-fetch. I understand that doing a fetch
, fetches the remote refs into a local tracking branch.
I have a few questions though:
Can it be possible that a local tracking branch does not exist? If so, will it then be created automatically?
What will happen if I do a
fetch
and specify a non tracking branch as the destination?The man page for git-fetch specifies:
git-fetch <options> <repository> <refspec>
How would I use the refspec to fetch contents from my remote master into its remote tracking branch? I believe this may be possible if my current HEAD is on master and I run
git fetch origin master
However, can I use the <+?src:dest>
refspec to achieve the same thing? I think this will help me understand the concepts better.
And one more question:
My .git/config file has the following line for fetching (showing only relevant lines):
fetch = +refs/heads/*:refs/remotes/origin/*
Can someone please explain what this line exactly means?
First, there's no such concept of local tracking branches, only remote tracking branches. So origin/master is a remote tracking branch for master in the origin repo.
Typically you do git fetch $remote which updates all your remote tracking branches, and creates new ones if needed.
However, you can also specify a refspec, but that will not touch your remote tracking branches, instead, it will fetch the branch you specified and save it on FETCH_HEAD, unless you specify a destination. In general you don't want to mess with this.
Finally,
fetch = +refs/heads/*:refs/remotes/origin/*
That means if you do
git fetch origin
It will actually do:
git fetch origin +refs/heads/*:refs/remotes/origin/*
Which means a remote heads/foobar will be local remotes/origin/foobar, and the plus sign means they'll be updated even if they are not fast-forward.
Perhaps what you think as a tracking branch is something related to git pull and the merge config.
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