git - git父编号是如何分配的？

Question

来自 git-rev-parse 的文档:

^, e.g. HEAD^, v1.5.1^0

A suffix ^ to a revision parameter means the first parent of that
commit object. ^<n> means the <n>th parent (i.e. <rev>^ is equivalent
to <rev>^1). As a special rule, <rev>^0 means the commit itself and is
used when <rev> is the object name of a tag object that refers to a
commit object.

我知道 git commits 可以有多个父级，并且这种语法可以用来消除引用哪个父级的歧义，但是什么决定了哪个父级是“第一个父级”或“第二个父级”？是否仅基于 merge 提交时 check out 的提交？

例如，git checkout master; git merge feature 导致 master 成为 parent 1，而 git checkout feature; git merge master 会导致 feature 成为父级 1？还是这里发生了其他事情？

Answer 1

Is it just based on which commit was checked out when the commits were merged?

没错。您可以使用 git show 或 git cat-file -p HEAD 查看提交的父项。