Can I safely remove my Git topic branch that has been merged into master?

Question

如果我创建并推送了很久以前已合并到master的主题分支，是否可以安全地运行git push origin :foobranch而不必担心它会以某种方式删除合并到master或其他分支的数据？

Answer 1

As long as there are no outstanding commits, its safe. If you want to be sure

git checkout master
git merge foobranch

This should result in a fast-forward merge (that does not affect the history). If not, maybe there were unmerged commits. However, now you are completely safe

git branch -d foobranch
git push origin :foobranch

Answer 2

Yes, you can safely delete a branch that has been merged into another branch. Branches are like movable pointers into the commit graph, and if you delete a branch, it's just removing that pointer. The commit graph remains, and in your case the master branch will still contain the history of the branch you've removed.

Answer 3

It is perfectly safe.

Any commit is linked to a tree (ie, your project files), and potentially, several commits point to the same tree. It is only when no commit links to a tree anymore that it may be garbage collected.

If you still need to recollect it somehow and don't even have a local ref to the commit, there is the reflog, which is cleaned up only after 90 days (I think ) by default.

Answer 4

删除提交或分支不会影响其他分支上的其他提交，即使该提交是在分支之间共享的，或者该分支已合并到其他分支中也是如此。