反转 git fetch
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Reverse a git fetch
提问by user2141094
I have a thorough understanding of git, and the difference between pull, fetch, and merge. I have a remote that I track, fetch, and merge with occasionally, let say it's origin/master. What I'm looking to do is reverse the behavior of a 'git fetch'. It sounds goofy, but I want to un-update where my remote tracking branch points, to an older state, the state right before the last fetch. Is this possible?
我对 git 以及 pull、fetch 和 merge 之间的区别有一个透彻的了解。我有一个遥控器，我偶尔会跟踪、获取和合并，假设它是原点/主控。我要做的是逆转“git fetch”的行为。这听起来很愚蠢，但我想取消更新我的远程跟踪分支指向的旧状态，即上次获取之前的状态。这可能吗？
For example, lets say this is my workflow...
例如，假设这是我的工作流程......
git show origin/master # shows commit abc123
git fetch # yay i got something!
git show origin/master # shows commit def456
mystery command goes here so that...
神秘命令放在这里，以便...
git show origin/master # shows commit abc123
It's kind of a weird thing to want, but I have a crontab that watches a git repo to detect when there's something to fetch, and I'm having issues debugging the script that performs some actions based on this behavior. Instead of waiting for origin/master to change, I'd like to change it myself so I can debug my script!
这有点奇怪，但我有一个 crontab，它监视 git repo 以检测何时有要获取的东西，并且我在调试基于此行为执行某些操作的脚本时遇到问题。与其等待 origin/master 改变，我想自己改变它，这样我就可以调试我的脚本了！
采纳答案by jthill
You want
你要
git update-ref refs/remotes/origin/master refs/remotes/origin/master@{1}
git update-ref refs/remotes/origin/master refs/remotes/origin/master@{1}
update-refwants the full spell on the ref it's updating because it's (much) lower level than the commands that respect ref-naming conventions.
update-ref想要在它正在更新的 ref 上完整拼写，因为它比尊重 ref 命名约定的命令（远）低级别。
回答by Tasos Papastylianou
This isn't a "reverse a git fetch" answer, but it seems your actualproblem is how to programmatically "watch a repo for changes" without necessarily altering your repository in any way.
这不是“反向 git fetch”答案，但您的实际问题似乎是如何以编程方式“观察存储库的更改”而不必以任何方式更改存储库。
For this, you can use git fetch --dry-run. A dry run will not cause any changes to your repository, but if there are changes in the remote, then it will have some basic terminal output; if there are no changes there will not be any output. If you want to have this running as an automated script instead of a manual check, it should be relatively straightforward to create a simple bash script that tests git fetch --dry-runfor output.
为此，您可以使用git fetch --dry-run. 试运行不会对您的存储库造成任何更改，但是如果远程有更改，那么它将具有一些基本的终端输出；如果没有更改，则不会有任何输出。如果您想让它作为自动脚本运行而不是手动检查，那么创建一个简单的 bash 脚本来测试git fetch --dry-run输出应该相对简单。
回答by Dewey Sasser
I'm not sure if there's an actual git command to do it, and this is a big hackish, but...
我不确定是否有实际的 git 命令来执行此操作，这是一个很大的 hackish，但是...
echo $OLD_COMMIT > .git/refs/remotes/origin/master
should work
应该管用
回答by Stephan
I hope this time I got what you want and I think it's this:
我希望这次我得到了你想要的，我想是这样的：
git rebase origin/master --onto origin/master^
