這篇會筆記如何將 Github 上專案內的 Pull Request 拉到 Local 端電腦，雖然現在大部分的 Open Source 都會寫 Unit Test 並且搭配免費的 Travis CI 自動化測試，但是有時候也是需要把別人的 Pull Request 拉下來測試後再進行 Merge，而 Github 官方有提供一篇說明文件 Checking out pull requests locally，底下紀錄操作步驟。
clone 新專案，修改設定檔
拿 gulp-compass 專案來測試
$ git clone https://github.com/appleboy/gulp-compass.git
接著打開 .git/config 可以看到底下設定檔
[remote "origin"]
fetch = +refs/heads/*:refs/remotes/origin/*
url = https://github.com/appleboy/gulp-compass.git
[branch "master"]
remote = origin
merge = refs/heads/master請增加一行 refspec 紀錄，修改狀態後為底下
[remote "origin"]
fetch = +refs/heads/*:refs/remotes/origin/*
url = https://github.com/appleboy/gulp-compass.git
fetch = +refs/pull/*/head:refs/pull/origin/*抓取遠端 Pull request
接著請執行 git fetch origin，可以看到底下結果
$ git fetch origin remote: Counting objects: 79, done. remote: Compressing objects: 100% (46/46), done. remote: Total 79 (delta 38), reused 59 (delta 28) Unpacking objects: 100% (79/79), done. From https://github.com/appleboy/gulp-compass * [new branch] refs/pull/1/head -> refs/pull/origin/1 * [new branch] refs/pull/10/head -> refs/pull/origin/10 * [new branch] refs/pull/12/head -> refs/pull/origin/12 * [new branch] refs/pull/16/head -> refs/pull/origin/16 * [new branch] refs/pull/21/head -> refs/pull/origin/21 * [new branch] refs/pull/23/head -> refs/pull/origin/23 * [new branch] refs/pull/26/head -> refs/pull/origin/26 * [new branch] refs/pull/28/head -> refs/pull/origin/28 * [new branch] refs/pull/5/head -> refs/pull/origin/5 * [new branch] refs/pull/6/head -> refs/pull/origin/6 * [new branch] refs/pull/7/head -> refs/pull/origin/7 * [new branch] refs/pull/8/head -> refs/pull/origin/8 * [new branch] refs/pull/9/head -> refs/pull/origin/9
請注意 refs/pull/ 是唯讀狀態，你無法 commit 任何程式碼上去
讀取特定 pull request
上述步驟完成後，可以直接執行底下指令，來讀取特定的 Pull request
$ git checkout -b 28 pull/origin/28 Switched to a new branch '28'
最後我們來看看線圖
* d0b3fc1 clear css folder before testing. (origin/master, origin/HEAD, master) | * 22b6362 update readme. | * eaf0cdb add test import_path array option. | * 9bc303c bump version. (1.1.6) | * 7e94db6 fixed coding style. | * f9f0350 Merge branch '28' |\ | | | * 3fa510d Fix garbled output. (HEAD, refs/pull/origin/28, 28) | | * | c3d8c18 update jshin to 1.5.0 and remove default parameter ".jshintrc". |/ | * 0e87ccf Merge pull request #26 from theblacksmith/multiple-import-paths
我們可以看到現在專案內的 HEAD 已經指向 #28 的 Pull request，請注意 (HEAD, refs/pull/origin/28, 28)，如果測試沒問題，就可以透過 git merge 回 master 分支
$ git checkout master $ git merge pull/origin/28 $ git push origin master
Github 上面預設是使用 git merge，當然你自己也可以用 git rebase 方式讓分支不要這麼亂。完成後上傳回 Github，你會發現該 pull request 就會被關閉並且 merge 完成。