src-kafka/tests/kafkatest/utils/remote_account.py

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
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def file_exists(node, file):
    """Quick and dirty check for existence of remote file."""
    try:
        node.account.ssh("cat " + file, allow_fail=False)
        return True
    except:
        return False

def path_exists(node, path):
    """Quick and dirty check for existence of remote path."""
    try:
        node.account.ssh("ls " + path, allow_fail=False)
        return True
    except:
        return False

def line_count(node, file):
    """Return the line count of file on node"""
    out = [line for line in node.account.ssh_capture("wc -l %s" % file)]
    if len(out) != 1:
        raise Exception("Expected single line of output from wc -l")

    return int(out[0].strip().split(" ")[0])