combox/file.py: defined hash_file function.

hash_file function returns the SHA512 hash of the file's content.

The test for the hash_file function is at tests/file_test.py

2 files changed, 26 insertions, 1 deletions

diff --git a/combox/file.py b/combox/file.py
index 563e8cd..e4677e9 100644
--- a/combox/file.py
+++ b/combox/file.py
@@ -18,6 +18,7 @@
 
 import os
 
+from hashlib import sha512
 from os import path
 from sys import exit
 from glob import glob
@@ -243,6 +244,18 @@ def read_file(filename):
     return file_.read()
 
 
+def hash_file(filename):
+    """Does a SHA512 hash on the contents of file.
+
+    Returns the hexdigest of the file content's hash.
+
+    filename: Absolute pathname of the file.
+    """
+    file_content = read_file(filename)
+
+    return sha512(file_content).hexdigest()
+
+
 def write_file(filename, filecontent):
     """Write `filecontent' to `filename'.
 
diff --git a/tests/file_test.py b/tests/file_test.py
index 558bcd7..4787406 100644
--- a/tests/file_test.py
+++ b/tests/file_test.py
@@ -18,13 +18,15 @@
 
 import yaml
 
+from hashlib import sha512
 from glob import glob
 from nose.tools import *
 from os import path, remove
 
 from combox.config import get_nodedirs
 from combox.file import (split_data, glue_data, write_file,
-                  read_file, write_shards, read_shards)
+                         read_file, write_shards, read_shards,
+                         hash_file)
 
 CONFIG_DIR = path.join('tests', 'test-config')
 
@@ -82,3 +84,13 @@ and check if they're the same as the orginal file.
     f_content_glued = glue_data(f_shards)
 
     assert f_content == f_content_glued
+
+
+def test_hashing():
+    """
+    Tests the hashing function - hash_file
+    """
+    fhash = hash_file(TEST_FILE)
+    fcontent = read_file(TEST_FILE)
+
+    assert fhash == sha512(fcontent).hexdigest()