How to get ALL hashes that are being committed in a pre-receive hook?

Question

I am writing a pre-receive hook for Git. This is the one where if multiple commits are pushed, and any one of them fail, then the whole push fails. Which is what I want.

Answer 1

while read old new ref; do 
    [[ $new = *[^0]* ]] && news="$news $new"
done
git rev-list $news --not --all

This will avoid things like fastforwards over previously-pushed commits triggering wasted revalidation of unchanged content.