#!/usr/bin/env python3
#
# Copyright 2023 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Ensures inputs exist and writes a stamp file."""

import argparse
import pathlib
import sys


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('--stamp', help='Path to touch on success.')
    parser.add_argument('inputs', nargs='+', help='Files to check.')

    args = parser.parse_args()

    for path in args.inputs:
        path_obj = pathlib.Path(path)
        if not path_obj.is_file():
            if not path_obj.exists():
                sys.stderr.write(f'File not found: {path}\n')
            else:
                sys.stderr.write(f'Not a file: {path}\n')
            sys.exit(1)

    if args.stamp:
        pathlib.Path(args.stamp).touch()


if __name__ == '__main__':
    main()