python + flake8 pre-receive git hook

pre-receive

#!/bin/bash

if test -n "$GIT_PUSH_OPTION_COUNT"
then
  i=0
  while test "$i" -lt "$GIT_PUSH_OPTION_COUNT"
  do
    eval "value=\$GIT_PUSH_OPTION_$i"
    case "$value" in
    force)
      echo "Force push"
      exit 0
      ;;
    esac
    i=$((i + 1))
  done
fi

set -e

zero_commit="0000000000000000000000000000000000000000"
while read oldrev newrev refname; do
  # Pass delete operation. ($newrev is zero commit)
  if [[ $newrev == $zero_commit ]]; then
    continue
  fi
  # Handle only branch. Pass tags (refs/tags/*) and tracking branch (refs/remotes/*).
  if [[ ! $refname =~ ^refs/heads/ ]]; then
    continue
  fi
  # new branch created
  if [[ $oldrev == $zero_commit ]]; then
    oldrev=HEAD
  fi

  WORKSPACE=$(mktemp -d -t "prerecv.XXXXXXXXXX")

  # Get the file names, without directory, of the files that have been modified
  # between the new revision and the old revision
  files=`git diff --name-only ${oldrev}..${newrev}`

  # also include config files
  files+='.flake8 setup.cfg tox.ini'

  # Get a list of all objects in the new revision
  objects=`git ls-tree --full-name -r ${newrev}`

  for file in $files; do
    # Search for the file name in the list of all objects
    object=`echo -e "${objects}" | egrep "(\s)${file}\$" | awk '{ print $3 }'`

    # If it's not present, then continue to the the next itteration
    if [ -z ${object} ]; then
      continue;
    fi

    # Otherwise, create all the necessary sub directories in the new temp directory
    mkdir -p "${WORKSPACE}/`dirname ${file}`" &>/dev/null
    # and output the object content into it's original file name
    git cat-file blob ${object} > ${WORKSPACE}/${file}
  done

  pushd "$WORKSPACE" > /dev/null
  {
    set +e
    flake8
    RET=$?
    set -e
  }
  popd > /dev/null
  rm -rf "$WORKSPACE" &> /dev/null

  if [ $RET -ne 0 ]; then
    echo "================"
    echo "PUSH IS REJECTED"
    echo "Use \"--push-option=force\" to push anyway."
    echo "================"
    exit $RET
  fi
done
exit 0