为什么使用 --single-branch 时 Git 无法解析远程分支？

Question

因此，我们经常通过使用 --single-branch 有效克隆来优化克隆。但是，我们以后无法获得额外的分支。在管道方面，带有和不带有 --single-branch 的 git clone 有什么区别？稍后我们如何获取其他分支？

标准克隆：

$ git clone -b branch-name https://repo.url standard
$ cd standard
$ git checkout remote-branch
Branch 'remote-branch' set up to track remote branch 'remote-branch' from 'origin'.
Switched to a new branch 'remote-branch'

单分支克隆：

$ git clone -b branch-name --single-branch https://repo.url singlebranch
$ cd singlebranch
$ git checkout remote-branch
error: pathspec 'remote-branch' did not match any file(s) known to git

更新

根据下面@AndrewMarshall 的回答，您需要更新配置中的默认 fetch refspec。即使您可以绕过 fetch 来获取正确的提交，但如果您不先修复配置，您尝试的结帐将绝对拒绝了解有关该分支的任何信息：

$ git fetch origin +refs/heads/remote-branch:refs/remotes/origin/remote-branch
From https://gerrit.magicleap.com/a/platform/mlmanifest
 * [new branch]      remote-branch -> origin/remote-branch

$ git checkout remote-branch 
error: pathspec 'remote-branch' did not match any file(s) known to git

$ git remote set-branches origin --add remote-branch
$ git checkout remote-branch 
Branch 'remote-branch' set up to track remote branch 'remote-branch' from 'origin'.
Switched to a new branch 'remote-branch'

请注意，我们获取它，然后重新配置，然后结帐。获取可以以任何顺序发生（尽管如果不在配置中，您必须传递参数）但结帐由配置门控。

Answer 1

--single-branch通过将远程的fetch属性设置为单个分支名称而不是 glob 来工作：

$ git config --get-all remote.origin.fetch
+refs/heads/master:refs/remotes/origin/master

所以让我们添加一个条目git remote set-branches：

$ git remote set-branches origin --add other-branch
$ git config --get-all remote.origin.fetch    
+refs/heads/master:refs/remotes/origin/master
+refs/heads/other-branch:refs/remotes/origin/other-branch

$ git fetch
From origin
 * [new branch]      other-branch        -> origin/other-branch

$ git checkout other-branch
Branch 'other-branch' set up to track remote branch 'other-branch' from 'origin'.
Switched to a new branch 'other-branch'

或者，或者，将其设为 glob，以便可以获取所有分支（默认的非单分支行为）：

git remote set-branches origin '*'