old_contents: import os
  import subprocess
  
  project_dir = '{{cookiecutter.repo_name}}'
  hooks_dir = os.path.join(project_dir, '.git/hooks')
  
  src = os.path.join(project_dir, 'src/utils/prepare-commit-msg.py')
  dst = os.path.join(hooks_dir, 'prepare-commit-msg')
  
  process = subprocess.call('git', 'init', project_dir)
  
  os.mkdir('{{cookiecutter.repo_name}}/.git/hooks')
  os.symlink(src, dst)
  
new_contents: import os
  import subprocess
  
  project_dir = '{{cookiecutter.repo_name}}'
  hooks_dir = os.path.join(project_dir, '.git/hooks')
  
  src = os.path.join(project_dir, 'src/utils/prepare-commit-msg.py')
  dst = os.path.join(hooks_dir, 'prepare-commit-msg')
  
  process = subprocess.call(['git', 'init', project_dir])
  
  os.mkdir('{{cookiecutter.repo_name}}/.git/hooks')
  os.symlink(src, dst)
  
subject: Correct argument to subprocess.call