本文以 skywalking-rocketbot-ui子模块合并到 skywalking 为例，手把手教你如何把 Git 子模块更新到主项目中去。
首先，把fork的skywalking项目克隆到本地：
OneMore MINGW64 /d/code$ git clone https://github.com/heihaozi/skywalking.git skywalkingCloning into 'skywalking'...remote: Enumerating objects: 241687, done.remote: Counting objects: 100% (373/373), done.remote: Compressing objects: 100% (201/201), done.remote: Total 241687 (delta 64), reused 240 (delta 21), pack-reused 241314Receiving objects: 100% (241687/241687), 156.98 MiB | 3.83 MiB/s, done.Resolving deltas: 100% (93272/93272), done.Updating files: 100% (5928/5928), done.进入skywalking目录，设置用户名和邮箱：
OneMore MINGW64 /d/code$ cd skywalking/OneMore MINGW64 /d/code/skywalking (master)$ git config user.name CharliePuOneMore MINGW64 /d/code/skywalking (master)$ git config user.email heihaozi2006@163.com指定将与复刻同步的远程上游仓库：
OneMore MINGW64 /d/code/skywalking (master)$ git remote add upstream https://github.com/apache/skywalking.git查看一下远程上游仓库是否生效：
OneMore MINGW64 /d/code/skywalking (master)$ git remote -vorigin https://github.com/heihaozi/skywalking.git (fetch)origin https://github.com/heihaozi/skywalking.git (push)upstream https://github.com/apache/skywalking.git (fetch)upstream https://github.com/apache/skywalking.git (push)没有问题，初始化本地子模块：
OneMore MINGW64 /d/code/skywalking (master)$ git submodule initSubmodule 'apm-protocol/apm-network/src/main/proto' (https://github.com/apache/skywalking-data-collect-protocol.git) registered for path 'apm-protocol/apm-network/src/main/proto'Submodule 'oap-server/server-query-plugin/query-graphql-plugin/src/main/resources/query-protocol' (https://github.com/apache/skywalking-query-protocol.git) registered for path 'oap-server/server-query-plugin/query-graphql-plugin/src/main/resources/query-protocol'Submodule 'skywalking-ui' (https://github.com/apache/skywalking-rocketbot-ui.git) registered for path 'skywalking-ui'Submodule 'test/e2e/e2e-protocol/src/main/proto' (https://github.com/apache/skywalking-data-collect-protocol.git) registered for path 'test/e2e/e2e-protocol/src/main/proto'从子模块的远端更新修改：
OneMore MINGW64 /d/code/skywalking (master)$ git submodule updateCloning into 'D:/code/skywalking/apm-protocol/apm-network/src/main/proto'...Cloning into 'D:/code/skywalking/oap-server/server-query-plugin/query-graphql-plugin/src/main/resources/query-protocol'...Cloning into 'D:/code/skywalking/skywalking-ui'...Cloning into 'D:/code/skywalking/test/e2e/e2e-protocol/src/main/proto'...Submodule path 'apm-protocol/apm-network/src/main/proto': checked out 'e626ee04850703c220f64b642d2893fa65572943'Submodule path 'oap-server/server-query-plugin/query-graphql-plugin/src/main/resources/query-protocol': checked out '47202fc1eaa1864c587a78f423a0685ffbe294ad'Submodule path 'skywalking-ui': checked out '9e56d6cbbaff4678751f5355b953db3bbfd99c9b'Submodule path 'test/e2e/e2e-protocol/src/main/proto': checked out 'e626ee04850703c220f64b642d2893fa65572943'从子模块的远端拉取上游的修改：
OneMore MINGW64 /d/code/skywalking (master)$ git submodule update --remoteSubmodule path 'skywalking-ui': checked out '774b69dd84e305be975e4c5ffc0d433aa8cbda32'检查当前文件状态：
OneMore MINGW64 /d/code/skywalking (master)$ git statusOn branch masterYour branch is up to date with 'origin/master'.Changes not staged for commit: (use "git add <file>..." to update what will be committed) (use "git restore <file>..." to discard changes in working directory) modified: skywalking-ui (new commits)no changes added to commit (use "git add" and/or "git commit -a")发现skywalking-ui已经有更新了，可以直接将其提交到远端，也可以修改其他文件一起提交。
这里先修改一下CHANGES.md文件，然后一起提交：
OneMore MINGW64 /d/code/skywalking (master)$ git add skywalking-uiOneMore MINGW64 /d/code/skywalking (master)$ git add CHANGES.mdOneMore MINGW64 /d/code/skywalking (master)$ git statusOn branch masterYour branch is up to date with 'origin/master'.Changes to be committed: (use "git restore --staged <file>..." to unstage) modified: CHANGES.md modified: skywalking-uiOneMore MINGW64 /d/code/skywalking (master)$ git push origin masterEnumerating objects: 5, done.Counting objects: 100% (5/5), done.Delta compression using up to 8 threadsCompressing objects: 100% (3/3), done.Writing objects: 100% (3/3), 409 bytes | 409.00 KiB/s, done.Total 3 (delta 2), reused 0 (delta 0), pack-reused 0remote: Resolving deltas: 100% (2/2), completed with 2 local objects.To https://github.com/heihaozi/skywalking.git 50688c187..e4a61f183 master -> master至此，大功告成，可以向社区提交PR了。
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