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,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

import subprocess

import time

import signal

from image_creator.util import FatalError

class Rsync:

    """Wrapper class for the rsync command"""

    def __init__(self, src, dest, exclude=[]):

        """Create an instance by defining a source, a destinationa and a number

        of exclude patterns.

        """

        self.src = src

        self.dest = dest

        self.exclude = exclude

        self.options = ['-v']

    def archive(self):

        """Enable the archive option"""

        self.options.append('-a')

        return self

    def run(self, out):

        """Run the actual command"""

        cmd = []

        cmd.append('rsync')

        cmd.extend(self.options)

        for i in self.exclude:

            cmd.extend(['--exclude', i])

        out.output("Calculating total number of host files ...", False)

        dry_run = subprocess.Popen(cmd + ['-n', self.src, self.dest],

                                   shell=False, stdout=subprocess.PIPE,

                                   bufsize=0)

        try:

            total = 0

            for line in iter(dry_run.stdout.readline, b''):

                total += 1

        finally:

            dry_run.communicate()

            if dry_run.returncode != 0:

                raise FatalError("rsync failed")

        out.success("%d" % total)

        progress = out.Progress(total, "Copying files into the image ... ")

        run = subprocess.Popen(cmd + [self.src, self.dest], shell=False,

                               stdout=subprocess.PIPE, bufsize=0)

        try:

            t = time.time()

            i = 0

            for line in iter(run.stdout.readline, b''):

                i += 1

                current = time.time()

                if current - t > 0.1:

                    t = current

                    progress.goto(i)

            progress.success('done')

        finally:

            run.poll()

            if run.returncode is None:

                run.send_signal(signal.SIGHUP)

            run.communicate()

            if run.returncode != 0:

                raise FatalError("rsync failed")

# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :