TestBase.py 文件源码

def touch(self, path, size=None, random=False, perm=None, time=None):
        """Simplify the dynamic creation of files or the updating of their
        modified time.  If a size is specified, then a file of that size
        will be created on the disk. If the file already exists, then the
        size= attribute is ignored (for safey reasons).

        if random is set to true, then the file created is actually
        created using tons of randomly generated content.  This is MUCH
        slower but nessisary for certain tests.

        """

        path = abspath(path)
        if not isdir(dirname(path)):
            mkdir(dirname(path), 0700)

        if not exists(path):
            size = strsize_to_bytes(size)

            if not random:
                f = open(path, "wb")
                if isinstance(size, int) and size > 0:
                    f.seek(size-1)
                    f.write("\0")
                f.close()

            else: # fill our file with randomly generaed content
                with open(path, 'wb') as f:
                    # Fill our file with garbage
                    f.write(urandom(size))

        # Update our path
        utime(path, time)

        if perm is not None:
            # Adjust permissions
            chmod(path, perm)

        # Return True
        return True