On 2019-07-05 at 22:01:59, scott douglass wrote: > Hi, > > I’d like to be able to discover the new parents-to-be SHA-1s during > the hooks that run before a commit*. Essentially I’d like be able to > distinguish the ‘git commit’ case from ‘git commit —amend’. Is there > already a way to do this that I have overlooked? (I’ve read ‘man > githooks’ and searched the wiki and various other places.)
I'm not aware of a way to distinguish this currently, although I agree having a way would be valuable. There are of course heuristic ways, but they can be fooled. > If not, I would propose that perhaps the hooks could be passed a > GIT_PARENTS (or perhaps GIT_NEW_PARENTS) environment variable which in > the ‘not amend’ case would contain the SHA-1 for HEAD and MERGE_HEAD > (if appropriate) and in the ‘—amend' case would contain HEAD^@ (all of > the parents of HEAD). I think we'd probably skip such functionality in favor of exposing whether a commit is to be amended or not and let you script the parents yourself. There are a lot of cases where one might want to know whether a commit was amended, but knowing that, you can determine the parents and anything else without much difficulty, so the amended option seems like the more general feature to implement. -- brian m. carlson: Houston, Texas, US OpenPGP: https://keybase.io/bk2204
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