最近发现构建任务每次拉取源码都要十几分钟，还以为是网络问题，看了一下带宽10M/s的速度，就把代码clone下来查看了一番，结果发现是.git文件太大了
看到源码里的pack-de142cec88f171d669655695a176e11d052ad2fa.pack达到惊人的5.3G，既然发现了那就准备开始清理
首先查找最占空间的大文件名
# git rev-list –objects –all | grep “$(git verify-pack -v .git/objects/pack/*.idx | sort -k 3 -n | tail -20 | awk ‘{print$1}’)”
rev-list：用来列出Git仓库中的提交，列出所有提交中涉及的文件名及其ID。
–objects：列出该提交涉及的所有文件ID。
–all：所有分支的提交，相当于指定了位于/refs下的所有引用。
verify-pack：命令用于显示已打包的内容。
果不其然大文件都sql文件
开始删除操作
# git filter-branch –force –index-filter ‘git rm -rf –cached –ignore-unmatch xxx.sql’ –prune-empty –tag-name-filter cat — –all
filter-branch：可以用来重写Git仓库中的提交
–index-filter：用来指定一条Bash命令，然后Git会检出（checkout）所有的提交， 执行该命令，然后重新提交。
–all：表示我们需要重写所有分支（或引用）。
注意上述我列出了20个最大的文件，那么这里只删除一个xxx.sql是不全的，可以把这些文件名写入一个txt文档，然后通过cat挨个进行删除
推荐先这种方法，简单省事儿有效
# cat sql.txt
xxx.sql xxx.sql xxx.sql xxx.sql xxx.sql xxx.sql xxx.sql xxx.sql xxx.sql xxx.sql
# git filter-branch -f –prune-empty –index-filter “git rm -rf –cached –ignore-unmatch `cat sql.txt`” –tag-name-filter cat — –all
删除之后，强制覆盖的形式推送上去，我这里选择的分支是develop分支（不敢在主分支上霍霍怕挨揍）
# git push origin develop –force # 只推送到develop分支
# git push origin –force –all # 推送全部分支
三点特别注意：
第一：如果push的时候提示保护分支不可写，那么就在gitlab里设置去掉该分支为保护分支
第二：删除大文件需要删除全部分支的大文件，如果某个分支没有被删除大文件的话，那么这个分支在提交的时候会把这些记录再度写回去
第三：如果其他分支的人不想执行这么繁琐的删除操作，那么等删除所有分支大文件之后，需要删除本地代码从新拉取本分支的代码，这样就能避免已删除的旧数据再度上传上去
然后进行GC操作，彻底清空不需要的垃圾
# rm -rf .git/refs/original/
# git reflog expire –expire=now –all
# git gc –prune=now
自此，清理空间完成
查看一下效果，在Jenkins里面，下面将近12分钟的co是删除之前的，上面1分半是删除之后的
草你妈，不让赋值，你弄这东西有你妈的必用
没教养
这点禁止事件岂能拦住我堂堂抠图仔
开启调试器，随便复制。禁用复制有卵用？
为了让你们学会用，煞费苦心啊
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