[lnst] Utils: Adding md5sum function

[Jiří Pírko]

commit d3dd720293a44a43331f6316bea33f2bab609880
Author: Radek Pazdera <rpazdera(a)redhat.com&gt;
Date:   Thu Nov 8 16:17:43 2012 +0100

    Utils: Adding md5sum function
    
    This function can be used to compute a hash of a file.
    
    Signed-off-by: Radek Pazdera <rpazdera(a)redhat.com&gt;

 Common/Utils.py |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/Common/Utils.py b/Common/Utils.py
index bae3043..8d00a00 100644
--- a/Common/Utils.py
+++ b/Common/Utils.py
@@ -12,6 +12,7 @@ jzupka(a)redhat.com (Jiri Zupka)
 import logging
 import time
 import re
+import hashlib
 
 def die_when_parent_die():
     try:
@@ -85,3 +86,14 @@ def bool_it(val):
         elif re.match("^\s*(?i)(false)", val):
             return False
     return True if int_it(val) else False
+
+def md5sum(file_path, block_size=2**20):
+    md5 = hashlib.md5()
+    with open(file_path, "rb") as f:
+        while True:
+            data = f.read(block_size)
+            if not data:
+                break
+            md5.update(data)
+
+    return md5.hexdigest()