-#!/usr/bin/env python
+# 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 sys
import pbs
+import hashlib
+
+
+class FatalError(Exception):
+ pass
+
def get_command(command):
def find_sbin_command(command, exception):
return pbs.__getattr__(command)
except pbs.CommadNotFount as e:
return find_sbin_command(command, e)
+
+
+class MD5:
+ def __init__(self, output):
+ self.out = output
+
+ def compute(self, filename, size):
+
+ MB = 2 ** 20
+ BLOCKSIZE = 4 * MB # 4MB
+
+ prog_size = ((size + MB - 1) // MB) # in MB
+ progressbar = self.out.Progress(prog_size, "Calculating md5sum", 'mb')
+ 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
+ progressbar.goto((size - left) // MB)
+
+ checksum = md5.hexdigest()
+ progressbar.success(checksum)
+
+ return checksum
+
+# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :