#!/bin/bash

while read oldrev newrev refname
do
  range=""
  # $oldrev may be "0000000000000000000000000000000000000000" in case if
  # the repo is empty, so we need to ignore range in that case and apply it
  # only for regular cases.
  if [[ ! "$oldrev" =~ ^0{1,}$ ]]; then
    range="$oldrev.."
  fi
  git log $range --pretty=format:'sha:%H, author:%ae, time:%ai' --no-merges > /tmp/logs.txt
done