What's the best way to find old detached HEAD after repo sync?

Question

假设当前分离的HEAD上有一些本地提交（A，A1，A2，A3）指向提交A，在repo同步之后，本地分离的HEAD被指向提交B的远程最新分离的HEAD覆盖，什么是找到旧提交（A，A1，A2，A3）的最佳方法？

Answer 1

The simplest way I can imagine is:

1. git reflog to find A:

HEAD@{1}: checkout: moving from A to B

2. Then you can do anything to A, like

• create a new branch for it in case missing it again: git switch -c branchname A , or
• rebase or merge it to the current HEAD: git rebase A / git merge A , then you will see all A, A1, A2, A3 appear on the current HEAD once all conflictions(if any) are resolved, and don't forget to create a new branch with git switch -c .

Answer 2

If there were no additional operations that moved HEAD around, you could use HEAD@{1} to know the exact previous location of HEAD before current. Can use different numbers, of course:

git log HEAD@{1}