Git Push后GitHub未显示‘Compare & pull request’按钮问题排查

我正在学习GitHub版本控制和Git命令，重点理解push和pull request概念。按照教程操作后，期望在GitHub看到‘Compare & pull request’按钮，但操作无报错却没看到该按钮，请问我遗漏了哪一步？

操作步骤 #

• 先fork了仓库kedark3/demo
• 执行本地操作：
  1. 克隆仓库：git clone https://github.com/rejkid-tester/Demo.git到本地文件夹
  2. 创建分支：git branch new_branch
  3. 切换分支：git switch new_branch
  4. 用notepad.exe修改仓库中"test"文件内容
• 提交并推送变更：
  a) git add .
  b) git commit -m "Test"
  c) git push origin new_branch

push命令输出 #

PS C:\workspace\GITTest\Demo> git push origin new_branch
Enumerating objects: 5, done.
Counting objects: 100% (5/5), done.
Delta compression using up to 8 threads
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 334 bytes | 334.00 KiB/s, done.
Total 3 (delta 1), reused 0 (delta 0), pack-reused 0
remote: Resolving deltas: 100% (1/1), completed with 1 local object.
remote:
remote: Create a pull request for 'new_branch' on GitHub by visiting:
remote:      https://github.com/rejkid-tester/Demo/pull/new/new_branch
remote:
To https://github.com/rejkid-tester/Demo.git
 * [new branch]      new_branch -> new_branch

git config信息 #

PS C:\workspace\GITTest\Demo> git config --list
diff.astextplain.textconv=astextplain
filter.lfs.clean=git-lfs clean -- %f
filter.lfs.smudge=git-lfs smudge -- %f
filter.lfs.process=git-lfs filter-process
filter.lfs.required=true
http.sslbackend=openssl
http.sslcainfo=C:/Program Files/Git/mingw64/ssl/certs/ca-bundle.crt
core.autocrlf=true
core.fscache=true
core.symlinks=false
core.editor="C:\Program Files (x86)\Notepad++\notepad++.exe" -multiInst -notabbar -nosession -noPlugin
pull.rebase=false
credential.helper=manager
credential.https://dev.azure.com.usehttppath=true
init.defaultbranch=master
user.email=rejkid@gmail.com
user.name=rejkid-tester
core.repositoryformatversion=0
core.filemode=false
core.bare=false
core.logallrefupdates=true
core.symlinks=false
core.ignorecase=true
remote.origin.url=https://github.com/rejkid-tester/Demo.git
remote.origin.fetch=+refs/heads/*:refs/remotes/origin/*
branch.master.remote=origin
branch.master.merge=refs/heads/master
remote.upstream.url=https://github.com/kedark3/demo
remote.upstream.fetch=+refs/heads/*:refs/remotes/upstream/*

问题解答 #

你已经把分支推送到了自己的fork仓库（rejkid-tester/Demo），但GitHub默认只会提示向你自己仓库的master分支创建PR。而你需要的是向原仓库（kedark3/demo）提交PR，所以需要手动切换目标仓库：

1. 打开你自己的fork仓库页面，找到刚推送的new_branch分支
2. 如果没直接看到"Compare & pull request"按钮，就点击分支旁的"Pull request"按钮进入PR创建页面
3. 在页面顶部，将base repository从你的仓库切换为原仓库kedark3/demo，base分支选择对应目标分支（比如master）
4. 确认head repository是你的fork仓库、分支是new_branch，填写PR信息后提交即可

另外，push输出里的链接打开后，也可以在PR创建页面手动切换目标仓库完成操作。

内容的提问来源于stack exchange，提问作者janci