root / image_creator / util.py @ 331aa0ec
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# Copyright 2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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import sys |
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import pbs |
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import hashlib |
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from colors import red, green, yellow |
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from progress.bar import Bar |
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class FatalError(Exception): |
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pass
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silent = False
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def get_command(command): |
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def find_sbin_command(command, exception): |
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search_paths = ['/usr/local/sbin', '/usr/sbin', '/sbin'] |
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for fullpath in map(lambda x: "%s/%s" % (x, command), search_paths): |
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if os.path.exists(fullpath) and os.access(fullpath, os.X_OK): |
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return pbs.Command(fullpath)
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raise exception
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try:
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return pbs.__getattr__(command)
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except pbs.CommadNotFount as e: |
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return find_sbin_command(command, e)
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def error(msg, new_line=True): |
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nl = "\n" if new_line else '' |
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sys.stderr.write(red('Error: %s' % msg) + nl)
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def warn(msg, new_line=True): |
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if not silent: |
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nl = "\n" if new_line else '' |
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sys.stderr.write(yellow("Warning: %s" % msg) + nl)
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def success(msg, new_line=True): |
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if not silent: |
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nl = "\n" if new_line else '' |
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sys.stdout.write(green(msg) + nl) |
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if not nl: |
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sys.stdout.flush() |
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def output(msg="", new_line=True): |
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if not silent: |
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nl = "\n" if new_line else '' |
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sys.stdout.write(msg + nl) |
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if not nl: |
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sys.stdout.flush() |
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def progress(message='', bar_type="default"): |
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MESSAGE_LENGTH = 30
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suffix = { |
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'default': '%(index)d/%(max)d', |
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'percent': '%(percent)d%%', |
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'b': '%(index)d/%(max)d B', |
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'kb': '%(index)d/%(max)d KB', |
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'mb': '%(index)d/%(max)d MB' |
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} |
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bar = Bar() |
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bar.message = message.ljust(MESSAGE_LENGTH) |
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bar.fill = '#'
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bar.suffix = suffix[bar_type] |
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bar.bar_prefix = ' ['
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bar.bar_suffix = '] '
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return bar
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def md5(filename, size): |
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BLOCKSIZE = 2 ** 22 # 4MB |
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progressbar = progress("Calculating md5sum:", 'mb') |
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progressbar.max = ((size + 2 ** 20 - 1) // (2 ** 20)) |
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md5 = hashlib.md5() |
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with open(filename, "r") as src: |
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left = size |
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while left > 0: |
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length = min(left, BLOCKSIZE)
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data = src.read(length) |
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md5.update(data) |
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left -= length |
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progressbar.goto((size - left) // (2 ** 20)) |
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checksum = md5.hexdigest() |
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output("\rCalculating md5sum...\033[K", False) |
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success(checksum) |
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return checksum
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# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :
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