Pre-receive hook to limit maximum git file size (attempt 2 - checks all objects but is slow)

git-pre-receive-log.sh

#!/bin/bash -e

nullsha="0000000000000000000000000000000000000000"
maxsize=5
maxbytes=$(( $maxsize * 1024 * 1024 ))
status=0

# Read stdin for ref information
while read oldref newref refname; do
  echo ref: $oldref $newref $refname

  # Skip branch deletions
  if [ "$newref" = "$nullsha" ]; then
    continue
  fi

  # Set oldref to HEAD if this is branch creation
  if [ "$oldref" = "$nullsha" ]; then
    oldref="HEAD"
  fi

  # Loop through commits
  for commit in $(git log --format=%H ${oldref}..${newref}); do
    echo commit: $commit

    # Inspect objects in commit
    for file in $(git ls-tree -l -r $commit | awk -v maxbytes="$maxbytes" '$4 > maxbytes { print $5 }'); do
      # Display error header if this is the first offending file
      if [ "$status" -eq "0" ]; then
        status=1
        echo ""
        echo "---------------------------------------------------------------------------"
        echo "Your push was rejected because it contains files larger than $maxsize MB."
        echo "Please discuss with the infra team the best place to store these files."
        echo "You might want to consider using https://git-lfs.github.com/ instead."
        echo "---------------------------------------------------------------------------"
        echo
        echo "Offending files:"
      fi

      echo " - $file"
    done
  done
done

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