Fwd: Discovering the new parents in commit hooks

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.)

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).

[*] Specifically, it seems a useful thing to be able to find out in these hooks: applypatch-msg, pre-applypatch, commit-msg, prepare-commit-msg, commit-msg

Thanks.