Synnefo » snf-image-creator

# Copyright 2012 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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import sys

import pbs

import hashlib

from clint.textui import colored, progress as uiprogress

class FatalError(Exception):

    pass

silent = False

def get_command(command):

    def find_sbin_command(command, exception):

        search_paths = ['/usr/local/sbin', '/usr/sbin', '/sbin']

        for fullpath in map(lambda x: "%s/%s" % (x, command), search_paths):

            if os.path.exists(fullpath) and os.access(fullpath, os.X_OK):

                return pbs.Command(fullpath)

        raise exception

    try:

        return pbs.__getattr__(command)

    except pbs.CommadNotFount as e:

        return find_sbin_command(command, e)

def error(msg, new_line=True):

    nl = "\n" if new_line else ''

    sys.stderr.write(colored.red('Error: %s' % msg) + nl)

def warn(msg, new_line=True):

    if not silent:

        nl = "\n" if new_line else ''

        sys.stderr.write(colored.yellow("Warning: %s" % msg) + nl)

def success(msg, new_line=True):

    if not silent:

        nl = "\n" if new_line else ''

        sys.stdout.write(colored.green(msg) + nl)

        if not nl:

            sys.stdout.flush()

def output(msg="", new_line=True):

    if not silent:

        nl = "\n" if new_line else ''

        sys.stdout.write(msg + nl)

        if not nl:

            sys.stdout.flush()

def progress(message=''):

    PROGRESS_LENGTH = 32

    MESSAGE_LENGTH = 32

    def progress_generator(n=100):

        position = 0

        msg = message.ljust(MESSAGE_LENGTH)

        for i in uiprogress.bar(range(n), msg, PROGRESS_LENGTH, silent):

            if i < position:

                continue

            position = yield

        yield  # suppress the StopIteration exception

    return progress_generator

def md5(filename, size, progress=None):

    BLOCKSIZE = 2 ^ 22  # 4MB

    md5 = hashlib.md5()

    with open(filename, "r") as src:

        left = size

        while left > 0:

            length = min(left, BLOCKSIZE)

            data = src.read(length)

            md5.update(data)

            left -= length

    return md5.hexdigest()

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