Git pre-commit hook to deny commits in production branches and for files larger than a specified size

pre-commit

#!/usr/bin/env ruby

# (1) Prevent any commit to production branches

PRODUCTION_BRANCHES = ["production"]

branch = `git rev-parse --abbrev-ref=strict HEAD`.chomp

if (PRODUCTION_BRANCHES.include?(branch))
  puts "\nDo you really want to commit on '#{branch}' branch?\nIf yes, add --no-verify to the commit command to force it."
  exit 1
end

# (2) Prevent any commit of big files

MAX_FILE_SIZE = 10 * 1000 * 1024 # 10MB

files = `git status --porcelain`.split("\n")

files.each do |file|
  realfile = file.split(/\s+/)[-1]
  realfile_size = File.size(realfile)
  if realfile_size > MAX_FILE_SIZE
    puts "\nFile '#{realfile}' has size #{realfile_size / 1024}KB which is bigger than max size #{MAX_FILE_SIZE / 1024}KB.\nAdd --no-verify to the commit command if you want to force the commit."
    exit 1
  end
end