Synnefo » snf-image-creator

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

#

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# without modification, are permitted provided that the following

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#

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#      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.

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# 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

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import sys

import pbs

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(label='', n=100):

    PROGRESS_LENGTH = 32

    MESSAGE_LENGTH = 32

    def progress_generator(label, n):

        position = 0

        for i in uiprogress.bar(range(n), label.ljust(MESSAGE_LENGTH), \

                                                    PROGRESS_LENGTH, silent):

            if i < position:

                continue

            position = yield

        yield  # suppress the StopIteration exception

    return progress_generator(label, n)

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