Git pre-commit hook to validate JSON files

pre-commit

#!/bin/bash

# Comments:
# 1. You must add execution rights to this file (chmod u+x pre-commit)
# 2. You need to have the 'jq' package installed to parse the json

if [ "$(command -v jq )" == "" ] ; then
  echo "jq required for pre-commit hook $0"
  exit 1
fi

if git-rev-parse --verify HEAD >/dev/null 2>&1; then
    against=HEAD
else
    against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

bad_file=0

for FILE in `git diff-index --name-status $against -- | cut -c3-` ; do

    if [ ${FILE: -5} == ".json" ]; then
      if [ -f ${FILE} ]; then
        jq . $FILE >/dev/null
        if [[ $? -ne 0 ]]; then
          echo "JSON parsing failed for: $FILE"
          bad_file=1
        fi
      fi
    fi
done

if [[ $bad_file -eq 1 ]]; then
  exit 1
fi

exit 0