pre-receive hook

pre-receive.tag-on-force-push

#!/bin/bash -e
# <oldrev> <newrev> <refname>
#Adapted from
#https://github.com/olshanov/git-hooks/blob/master/pre-receive.deny-force-push-to-branches
while read oldrev newrev ref
do
        if [[ "$oldrev" == "0000000000000000000000000000000000000000" ]]; then
                #create new branch
                continue;
        fi
        base=`git merge-base $oldrev $newrev`
        if [[ "${base}" != "${oldrev}" ]]; then
                #non fast-forward, mean force
                new_tag="FORCEPUSH-FROM-${oldrev}-TO-${newrev}"
                echo "Force update of $ref means a $new_tag tag will be created."

                #GIT_QUARANTINE_PATH is unset so that git does not complain of changing refs
                #when in a pre-receive hook. It is unlikely we fail here.
                env -u GIT_QUARANTINE_PATH git tag $new_tag
        fi
done

exit 0