def file(path=None, contents=None, source=None, url=None, md5=None,
         use_sudo=False, owner=None, group='', mode=None, verify_remote=True,
         temp_dir='/tmp'):
    """
    Require a file to exist and have specific contents and properties.

    You can provide either:

    - *contents*: the required contents of the file::

        from fabtools import require

        require.file('/tmp/hello.txt', contents='Hello, world')

    - *source*: the local path of a file to upload::

        from fabtools import require

        require.file('/tmp/hello.txt', source='files/hello.txt')

    - *url*: the URL of a file to download (*path* is then optional)::

        from fabric.api import cd
        from fabtools import require

        with cd('tmp'):
            require.file(url='http://example.com/files/hello.txt')

    If *verify_remote* is ``True`` (the default), then an MD5 comparison
    will be used to check whether the remote file is the same as the
    source. If this is ``False``, the file will be assumed to be the
    same if it is present. This is useful for very large files, where
    generating an MD5 sum may take a while.

    When providing either the *contents* or the *source* parameter, Fabric's
    ``put`` function will be used to upload the file to the remote host.
    When ``use_sudo`` is ``True``, the file will first be uploaded to a temporary
    directory, then moved to its final location. The default temporary
    directory is ``/tmp``, but can be overridden with the *temp_dir* parameter.
    If *temp_dir* is an empty string, then the user's home directory will
    be used.

    If `use_sudo` is `True`, then the remote file will be owned by root,
    and its mode will reflect root's default *umask*. The optional *owner*,
    *group* and *mode* parameters can be used to override these properties.

    .. note:: This function can be accessed directly from the
              ``fabtools.require`` module for convenience.

    """
    func = use_sudo and run_as_root or run

    # 1) Only a path is given
    if path and not (contents or source or url):
        assert path
        if not is_file(path):
            func('touch "%(path)s"' % locals())

    # 2) A URL is specified (path is optional)
    elif url:
        if not path:
            path = os.path.basename(urlparse(url).path)

        if not is_file(path) or md5 and md5sum(path) != md5:
            func('wget --progress=dot:mega %(url)s -O %(path)s' % locals())

    # 3) A local filename, or a content string, is specified
    else:
        if source:
            assert not contents
            t = None
        else:
            fd, source = mkstemp()
            t = os.fdopen(fd, 'w')
            t.write(contents)
            t.close()

        if verify_remote:
            # Avoid reading the whole file into memory at once
            digest = hashlib.md5()
            f = open(source, 'rb')
            try:
                while True:
                    d = f.read(BLOCKSIZE)
                    if not d:
                        break
                    digest.update(d)
            finally:
                f.close()
        else:
            digest = None

        if (not is_file(path, use_sudo=use_sudo) or
                (verify_remote and
                    md5sum(path, use_sudo=use_sudo) != digest.hexdigest())):
            with settings(hide('running')):
                put(source, path, use_sudo=use_sudo, temp_dir=temp_dir)

        if t is not None:
            os.unlink(source)

    # Ensure correct owner
    if use_sudo and owner is None:
        owner = 'root'
    if (owner and _owner(path, use_sudo) != owner) or \
       (group and _group(path, use_sudo) != group):
        func('chown %(owner)s:%(group)s "%(path)s"' % locals())

    # Ensure correct mode
    if use_sudo or mode is None:
        mode = oct(0666 & ~int(umask(use_sudo=True), base=8))
    if mode and _mode(path, use_sudo) != mode:
        func('chmod %(mode)s "%(path)s"' % locals())
dataset/ETHPy150Open ronnix/fabtools/fabtools/require/files.py/file/operator `and` -> `or`