pre-push.sh

#!/bin/bash -eu
# Taken from https://github.com/amacneil/git-banish-large-files/blob/master/pre-receive.sh
# The difference here is that we are doing a pre-push hook on the local side instead of a pre-receive hook like in the above link. 
# As a result, we want to read different variables from stdin than in the other script.
set -o pipefail

maxsize=100
maxbytes=$(( $maxsize * 1024 * 1024 ))
status=0

# Read stdin for ref information
while read local_ref local_sha remote_ref remote_sha;do
  
  # Find large objects in our local commit. Not pretty but it works.
  for file in $(git rev-list --objects ${local_sha} | \
      git cat-file --batch-check='%(objectname) %(objecttype) %(objectsize) %(rest)' | \
      awk -v maxbytes="$maxbytes" '$3 > maxbytes { print $4 }'); do

    # Display error header if this is the first offending file
    if [ "$status" -eq "0" ]; then
      status=1

      echo ""
      echo "-------------------------------------------------------------------------"
      echo "Your push was rejected because it contains files larger than $maxsize MB."
      echo "-------------------------------------------------------------------------"
      echo
      echo "Offending files:"
    fi

    echo " - $file"
  done
done

if [ "$status" -ne "0" ]; then echo; fi
exit $status