Added file digest computation

Support to compute file digest and save it to manifest file. Also extend
the manifest file module to be able to write content into temporary
file.

Change-Id: If1f3f42799eb527bdeac418d1a40aa203641f628
Issue-ID: VNFSDK-174
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/vnfsdk_pkgtools/packager/manifest.py b/vnfsdk_pkgtools/packager/manifest.py
index a2d9d70..d819a70 100644
--- a/vnfsdk_pkgtools/packager/manifest.py
+++ b/vnfsdk_pkgtools/packager/manifest.py
@@ -15,6 +15,7 @@
 
 from collections import namedtuple
 import os
+import tempfile
 
 import udatetime
 
@@ -158,7 +159,13 @@ class Manifest(object):
             ret += "Hash: %s\n" % digest[1]
         return ret
 
-    def update_to_file(self):
+    def update_to_file(self, temporary=False):
         content = self.return_as_string()
-        with open(os.path.join(self.root, self.path), 'w') as fp:
+        if temporary:
+            abs_path = tempfile.mktemp()
+        else:
+            abs_path = os.path.abspath(os.path.join(self.root, self.path))
+
+        with open(abs_path, 'w') as fp:
             fp.write(content)
+        return abs_path