Is there an easy way to find the SHA1 of the first commit in a project with a long history with git?
Just off the top of my HEAD, this should get one of the 'first' commits of the current branch.
git rev-list --reverse HEAD | head -1
(If the branch contiains two unrelated branches which have been merged together, it's not guaranteed which root you will get but you could use --date-order to select the oldest.)
git log --reverse | head -n1
来源：https://stackoverflow.com/questions/3270696/checking-out-a-projects-first-commit-with-git