如何找回git 中丢失的提交(commit)

在玩git的过程中,常有失误的时候,有时把需要的东东给删了。
不过没有关系,git给了我们一层安全网,让我们能有机会把失去的东东给找回来。

Let’s go!

准备

我们先创建一个用以实验的仓库,在里面创建了若干个提交和分支。
BTW:你可以直接把下面的命令复制到shell里执行。

mkdir recovery;cd recovery
git init
touch file
git add file
git commit -m "First commit"
echo "Hello World" > file
git add .
git commit -m "Greetings"
git branch cool_branch git checkout cool_branch
echo "What up world?" > cool_file
git add .
git commit -m "Now that was cool"
git checkout master
echo "What does that mean?" >> file 

恢复已删除分支提交

现在repo里有两个branch

$ git branch
cool_branch
* master

存储当前仓库未提交的改动

$ git stash save "temp save"
Saved working directory and index state On master: temp save
HEAD is now at e3c9b6b Greetings

删除一个分支

$ git branch -D cool_branch
Deleted branch cool_branch (was 2e43cd5). $ git branch * master

git fsck --lost-found 命令找出刚才删除的分支里面的提交对象。

$git fsck --lost-found dangling commit 2e43cd56ee4fb08664cd843cd32836b54fbf594a

用git show命令查看一个找到的对象的内容,看是否为我们所找的。

git show 2e43cd56ee4fb08664cd843cd32836b54fbf594a commit 2e43cd56ee4fb08664cd843cd32836b54fbf594a Author: liuhui <liuhui998[#]gmail.com> Date: Sat Oct 23 12:53:50 2010 +0800 Now that was cool diff --git a/cool_file b/cool_file new file mode 100644 index 0000000..79c2b89 --- /dev/null +++ b/cool_file @@ -0,0 +1 @@ +What up world?

这个提交对象确实是我们在前面删除的分支的内容;下面我们就要考虑一下要如何来恢复它了。

使用git rebase 进行恢复

 $git rebase 2e43cd56ee4fb08664cd843cd32836b54fbf594a First, rewinding head to replay your work on top of it... Fast-forwarded master to 2e43cd56ee4fb08664cd843cd32836b54fbf594a.

现在我们用git log命令看一下,看看它有没有恢复:

 $ git log commit 2e43cd56ee4fb08664cd843cd32836b54fbf594a Author: liuhui <liuhui998[#]gmail.com> Date: Sat Oct 23 12:53:50 2010 +0800 Now that was cool commit e3c9b6b967e6e8c762b500202b146f514af2cb05 Author: liuhui <liuhui998[#]gmail.com> Date: Sat Oct 23 12:53:50 2010 +0800 Greetings commit 5e90516a4a369be01b54323eb8b2660545051764 Author: liuhui <liuhui998[#]gmail.com> Date: Sat Oct 23 12:53:50 2010 +0800 First commit 

提交是找回来,但是分支没有办法找回来:

 liuhui@liuhui:~/work/test/git/recovery$ git branch * master

使用git merge 进行恢复

我们把刚才的恢复的提交删除

 $ git reset --hard HEAD^ HEAD is now at e3c9b6b Greetings 

再把刚删的提交给找回来:

 git fsck --lost-found dangling commit 2e43cd56ee4fb08664cd843cd32836b54fbf594a

不过这回我们用是合并命令进行恢复:

 $ git merge 2e43cd56ee4fb08664cd843cd32836b54fbf594a Updating e3c9b6b..2e43cd5 Fast-forward cool_file | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) create mode 100644 cool_file

git stash的恢复

前面我们用git stash把没有提交的内容进行了存储,如果这个存储不小心删了怎么办呢?

当前repo里有的存储:
$ git stash list
stash@{0}: On master: temp save

把它们清空:
$git stash clear
liuhui@liuhui:~/work/test/git/recovery$ git stash list

再用git fsck –lost-found找回来:
$git fsck –lost-found
dangling commit 674c0618ca7d0c251902f0953987ff71860cb067

用git show看一下回来的内容对不对:

$git show 674c0618ca7d0c251902f0953987ff71860cb067 commit 674c0618ca7d0c251902f0953987ff71860cb067
Merge: e3c9b6b 2b2b41e
Author: liuhui <liuhui998[#]gmail.com> Date: Sat Oct 23 13:44:49 2010 +0800 On master: temp save diff --cc file
index 557db03,557db03..f2a8bf3
--- a/file
+++ b/file
@@@ -1,1 -1,1 +1,2 @@@ Hello World ++What does that mean?

看起来没有问题,好的,那么我就把它恢复了吧:

$ git merge 674c0618ca7d0c251902f0953987ff71860cb067
Merge made by recursive. file | 1 + 1 files changed, 1 insertions(+), 0 deletions(-)

备注

这篇文章主要内容来自这里:The illustrated guide to recovering lost commits with Git ,我做了一些整理的工作。

如果对于文中的一些命令不熟,可以参考Git Community Book中文版

其实这里最重要的一个命令就是:git fsck –lost-found,因为git中把commit删了后,并不是真正的删除,而是变成了悬空对象(dangling commit)。我们只要把把这悬空对象(dangling commit)找出来,用git rebase 也好,用git merge 也行就能把它们给恢复。

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转载自jasonwang168.iteye.com/blog/793522