X-Git-Url: https://code.grnet.gr/git/snf-image-creator/blobdiff_plain/3ccb2618f3728bb7457e4e870753eeec833ea17c..6ca928ac8e5d26fe49b22ed3b7406d240193b9ad:/image_creator/util.py

diff --git a/image_creator/util.py b/image_creator/util.py
index 63346c8..bd34222 100644
--- a/image_creator/util.py
+++ b/image_creator/util.py
@@ -1,6 +1,44 @@
-#!/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):
@@ -14,3 +52,32 @@ def get_command(command):
         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 :