Gitlab update git hook to eslint commits and refuse if errors

update

#!/bin/bash

EXIT_CODE=0

REFNAME="$1"
OLDREV="$2"
NEWREV="$3"

# find file which have been Added, Copied, Modified or Renamed
UPDATED=`git diff-tree -r --diff-filter=ACMR --name-only $OLDREV $NEWREV '*.js'`
# alternative
# UPDATED=`git rev-list --objects master^..master | grep -e "\.js\$" | cut -f1 -d' ' | xargs git cat-file -p`
echo "Vediamo se hai fatto il bravo..."
sleep 2
echo
echo "------------------------------------------------------------------------"
echo "Files to Lint:"
echo "------------------------------------------------------------------------"
echo "$UPDATED"
echo "------------------------------------------------------------------------"
echo
echo "------> Linting....."
echo

if [ -z "$UPDATED" ]; then
    echo "Nothing to lint."
    exit 0
fi

# make tmp dir
TMP_DIR=`mktemp -d`

ESLINTRC=$TMP_DIR/.eslintrc

# extract .eslintrc file
git cat-file blob $NEWREV:.eslintrc > $ESLINTRC

# extract all updated files
for FILE in $UPDATED;
do
  FILE_PATH=`dirname $FILE`
  FULL_PATH=$TMP_DIR/$FILE_PATH
  mkdir -p $FULL_PATH
  git cat-file blob $NEWREV:$FILE > $TMP_DIR/$FILE
done

# Run ESLint with global node instead of gitlab-embedded one
OUTPUT=`PATH=/usr/bin:$PATH eslint --color --rule "import/no-unresolved: 0" $TMP_DIR`
EXIT_CODE=$?
SUMMARY=`echo "$OUTPUT" | tail -n 1`

# Cleanup
rm -rf $TMP_DIR
if [ -z "$OUTPUT" ]; then
    echo "Perfetto! Good job."
    exit 0
fi
if [ $EXIT_CODE -ne 0 ]; then
    echo "$OUTPUT"
    echo
    echo "Qualcuno ha fatto il monello.. ritenta, sarai più fortunato!"
    echo
    sleep 1
    exit $EXIT_CODE
fi
if [[ $SUMMARY != *"0 warnings"* ]]; then
    echo "$OUTPUT"
    echo
    echo "Uhm, per questa volta passi.. la prossima volta però 0 warnings!"
    echo
    sleep 1
    exit 0
fi