如何在git历史中查找/识别大型提交？

水深无声 2023-03-03 14:23 1阅读 0赞

本文翻译自：[How to find/identify large commits in git history?][How to find_identify large commits in git history]

*I've got a git repo of 300 MB.* **我有一个300 MB的git repo。** *My currently checked-out files weigh 2 MB, and the git repo weighs 298 MB.* **我目前检出的文件重2 MB，git repo重298 MB。** *This is basically a code-only repo that should not weigh more than a few MB.* **这基本上是一个仅限代码的回购，重量不应超过几MB。**

*Most likely, somebody at some point committed some heavy files by accident (video, huge images, etc), and then removed them... but not from git, so we have a history with useless large files.* **最有可能的是，有人在某个时候偶然犯了一些重文件（视频，巨大的图像等），然后将它们删除......但不是从git中删除，所以我们有无用大文件的历史。** *How can I track down the large files in the git history?* **如何在git历史记录中追踪大文件？** *There are 400+ commits, so going one by will be time-consuming.* **有400多个提交，所以一个接一个将是耗时的。**

***NOTE** : my question **is not about [how to remove the file][]** , but how to **find** it in the first place.* **注意 ：我的问题*不是关于[如何删除文件][how to remove the file]* ，而是如何在第一时间*找到*它。**

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### \#1楼 ###

参考：[https://stackoom.com/question/Izjt/如何在git历史中查找-识别大型提交][https_stackoom.com_question_Izjt_git_-]

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### \#2楼 ###

*I've found this script very useful in the past for finding large (and non-obvious) objects in a git repository:* **我发现这个脚本在过去非常有用，可以在git存储库中查找大型（和非显而易见的）对象：**

*  *[http://stubbisms.wordpress.com/2009/07/10/git-script-to-show-largest-pack-objects-and-trim-your-waist-line/][http_stubbisms.wordpress.com_2009_07_10_git-script-to-show-largest-pack-objects-and-trim-your-waist-line]* **[http://stubbisms.wordpress.com/2009/07/10/git-script-to-show-largest-pack-objects-and-trim-your-waist-line/][http_stubbisms.wordpress.com_2009_07_10_git-script-to-show-largest-pack-objects-and-trim-your-waist-line]**

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#!/bin/bash
    #set -x 
    
    # Shows you the largest objects in your repo's pack file.
    # Written for osx.
    #
    # @see https://stubbisms.wordpress.com/2009/07/10/git-script-to-show-largest-pack-objects-and-trim-your-waist-line/
    # @author Antony Stubbs
    
    # set the internal field separator to line break, so that we can iterate easily over the verify-pack output
    IFS=$'\n';
    
    # list all objects including their size, sort by size, take top 10
    objects=`git verify-pack -v .git/objects/pack/pack-*.idx | grep -v chain | sort -k3nr | head`
    
    echo "All sizes are in kB's. The pack column is the size of the object, compressed, inside the pack file."
    
    output="size,pack,SHA,location"
    allObjects=`git rev-list --all --objects`
    for y in $objects
    do
        # extract the size in bytes
        size=$((`echo $y | cut -f 5 -d ' '`/1024))
        # extract the compressed size in bytes
        compressedSize=$((`echo $y | cut -f 6 -d ' '`/1024))
        # extract the SHA
        sha=`echo $y | cut -f 1 -d ' '`
        # find the objects location in the repository tree
        other=`echo "${allObjects}" | grep $sha`
        #lineBreak=`echo -e "\n"`
        output="${output}\n${size},${compressedSize},${other}"
    done
    
    echo -e $output | column -t -s ', '

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*That will give you the object name (SHA1sum) of the blob, and then you can use a script like this one:* **这将为您提供blob的对象名称（SHA1sum），然后您可以使用如下脚本：**

*  *[Which commit has this blob?][Which commit has this blob]* **[哪个提交有这个blob？][Which commit has this blob]**

*... to find the commit that points to each of those blobs.* **...找到指向每个blob的提交。**

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### \#3楼 ###

***Step 1** Write all file SHA1s to a text file:* **步骤1将所有文件SHA1写入文本文件：**

git rev-list --objects --all | sort -k 2 > allfileshas.txt

***Step 2** Sort the blobs from biggest to smallest and write results to text file:* **步骤2将blob从最大到最小排序，并将结果写入文本文件：**

git gc && git verify-pack -v .git/objects/pack/pack-*.idx | egrep "^\w+ blob\W+[0-9]+ [0-9]+ [0-9]+$" | sort -k 3 -n -r > bigobjects.txt

***Step 3a** Combine both text files to get file name/sha1/size information:* **步骤3a合并两个文本文件以获取文件名/ sha1 / size信息：**

for SHA in `cut -f 1 -d\  < bigobjects.txt`; do
    echo $(grep $SHA bigobjects.txt) $(grep $SHA allfileshas.txt) | awk '{print $1,$3,$7}' >> bigtosmall.txt
    done;

***Step 3b** If you have file names or path names containing **spaces** try this variation of Step 3a.* **步骤3b如果您有包含空格的文件名或路径名，请尝试步骤3a的此变体。** *It uses `cut` instead of `awk` to get the desired columns incl.* **它使用`cut`而不是`awk`来获得所需的列。** *spaces from column 7 to end of line:* **从第7列到第1行的空格：**

for SHA in `cut -f 1 -d\  < bigobjects.txt`; do
    echo $(grep $SHA bigobjects.txt) $(grep $SHA allfileshas.txt) | cut -d ' ' -f'1,3,7-' >> bigtosmall.txt
    done;

*Now you can look at the file bigtosmall.txt in order to decide which files you want to remove from your Git history.* **现在，您可以查看文件bigtosmall.txt，以确定要从Git历史记录中删除哪些文件。**

***Step 4** To perform the removal (note this part is slow since it's going to examine every commit in your history for data about the file you identified):* **步骤4执行删除（请注意，此部分很慢，因为它将检查历史记录中有关您标识的文件的数据的每个提交）：**

git filter-branch --tree-filter 'rm -f myLargeFile.log' HEAD

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***Source*** **资源**

*Steps 1-3a were copied from [Finding and Purging Big Files From Git History][]* **步骤1-3a是[从Git History中查找和清除大文件][Finding and Purging Big Files From Git History]中复制的**

***EDIT*** **编辑**

*The article was deleted sometime in the second half of 2017, but [an archived copy of it][] can still be accessed using the [Wayback Machine][] .* **该文章于2017年下半年被删除，但仍可使用[Wayback Machine][]访问[其存档副本][an archived copy of it] 。**

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### \#4楼 ###

*I've found a one-liner solution on [ETH Zurich Department of Physics wiki page][] (close to the end of that page).* **我在[苏黎世联邦理工学院维基页面][ETH Zurich Department of Physics wiki page] （靠近[该页][ETH Zurich Department of Physics wiki page]末尾）找到了一个单线解决方案。** *Just do a `git gc` to remove stale junk, and then* **只需做一个`git gc`来删除过时的垃圾，然后**

git rev-list --objects --all \
      | grep "$(git verify-pack -v .git/objects/pack/*.idx \
               | sort -k 3 -n \
               | tail -10 \
               | awk '{print$1}')"

*will give you the 10 largest files in the repository.* **将为您提供存储库中的10个最大的文件。**

*There's also a lazier solution now available, [GitExtensions][] now has a plugin that does this in UI (and handles history rewrites as well).* **现在还有一个更加懒惰的解决方案， [GitExtensions][]现在有一个插件可以在UI中执行此操作（并处理历史记录重写）。**

![GitExtensions'查找大文件'对话框][GitExtensions 1]

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### \#5楼 ###

*You should use [BFG Repo-Cleaner][] .* **你应该使用[BFG Repo-Cleaner][] 。**

*According to the website:* **根据网站：**

> *The BFG is a simpler, faster alternative to git-filter-branch for cleansing bad data out of your Git repository history:* **BFG是git-filter-branch的一种更简单，更快速的替代方法，用于清除Git存储库历史记录中的错误数据：**
> 
>  *  *Removing Crazy Big Files* **删除疯狂的大文件**
>  *  *Removing Passwords, Credentials & other Private data* **删除密码，凭据和其他私人数据**

*The classic procedure for reducing the size of a repository would be:* **减小存储库大小的经典过程是：**

git clone --mirror git://example.com/some-big-repo.git
    java -jar bfg.jar --strip-biggest-blobs 500 some-big-repo.git
    cd some-big-repo.git
    git reflog expire --expire=now --all
    git gc --prune=now --aggressive
    git push

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### \#6楼 ###

*If you only want to have a list of large files, then I'd like to provide you with the following one-liner ( [source at renuo][] ):* **如果你只想要一个大文件列表，那么我想为你提供以下单行（ [来源于renuo][source at renuo] ）：**

join -o "1.1 1.2 2.3" <(git rev-list --objects --all | sort) <(git verify-pack -v objects/pack/*.idx | sort -k3 -n | tail -5 | sort) | sort -k3 -n

*Whose output will be:* **谁的输出将是：**

commit       file name                                  size in bytes
    
    72e1e6d20... db/players.sql 818314
    ea20b964a... app/assets/images/background_final2.png 6739212
    f8344b9b5... data_test/pg_xlog/000000010000000000000001 1625545
    1ecc2395c... data_development/pg_xlog/000000010000000000000001 16777216
    bc83d216d... app/assets/images/background_1forfinal.psd 95533848

*The last entry in the list points to the largest file in your git history.* **列表中的最后一个条目指向git历史记录中的最大文件。**

*You can use this output to assure that you're not deleting stuff with [BFG][] you would have needed in your history.* **您可以使用此输出来确保您不会删除历史记录中您需要的[BFG][]内容。**

[How to find_identify large commits in git history]: https://oldbug.net/q/Izjt/How-to-find-identify-large-commits-in-git-history
[how to remove the file]: https://stackoverflow.com/questions/2100907/how-to-purge-a-huge-file-from-commits-history-in-git
[https_stackoom.com_question_Izjt_git_-]: https://stackoom.com/question/Izjt/%E5%A6%82%E4%BD%95%E5%9C%A8git%E5%8E%86%E5%8F%B2%E4%B8%AD%E6%9F%A5%E6%89%BE-%E8%AF%86%E5%88%AB%E5%A4%A7%E5%9E%8B%E6%8F%90%E4%BA%A4
[http_stubbisms.wordpress.com_2009_07_10_git-script-to-show-largest-pack-objects-and-trim-your-waist-line]: http://stubbisms.wordpress.com/2009/07/10/git-script-to-show-largest-pack-objects-and-trim-your-waist-line/
[Which commit has this blob]: https://stackoverflow.com/q/223678/223092
[Finding and Purging Big Files From Git History]: http://naleid.com/blog/2012/01/17/finding-and-purging-big-files-from-git-history
[an archived copy of it]: https://web.archive.org/web/20170621125743/http://www.naleid.com/blog/2012/01/17/finding-and-purging-big-files-from-git-history
[Wayback Machine]: https://archive.org/web/
[ETH Zurich Department of Physics wiki page]: https://readme.phys.ethz.ch/documentation/git_advanced_hints/
[GitExtensions]: http://gitextensions.github.io/
[GitExtensions 1]: https://i.stack.imgur.com/mzKsE.png
[BFG Repo-Cleaner]: http://rtyley.github.io/bfg-repo-cleaner/
[source at renuo]: https://github.com/renuo/vcs-scripts#list_large_filessh
[BFG]: https://rtyley.github.io/bfg-repo-cleaner/