Fix packaging script - Memory error in md5 calculations

During package preparation whole file is read and stashed in to RAM. when the file is large, like ONAP package it will result in an error

Signed-off-by: Mateusz Pilat <m.pilat@partner.samsung.com>
Issue-ID: OOM-2308
Change-Id: Ic2dbea4018162bd4cfb380f6fb34078062c38a09
(cherry picked from commit f1d9816984b695fc4ae6a011c23c5f274385070e)

diff --git a/build/package.py b/build/package.py
index 7c35cf9..40b2c3a 100755 (executable)
--- a/build/package.py
+++ b/build/package.py
@@ -107,11 +107,13 @@ def add_checksum_info(output_dir):
     tar_files = ['resources_package.tar', 'aux_package.tar', 'sw_package.tar']
     for tar_file in tar_files:
         try:
-            data = os.path.join(output_dir, tar_file)
-            cksum = hashlib.md5(open(data, 'rb').read()).hexdigest()
+            checksum = hashlib.md5()
+            with open(os.path.join(output_dir, tar_file), 'rb') as f:
+                for chunk in iter(lambda: f.read(4096), b""):
+                    checksum.update(chunk)
             with open(os.path.join(output_dir, 'package.info'), 'r') as f:
                 json_data = json.load(f)
-                json_data['Build_info']['Packages'].update({tar_file: cksum})
+                json_data['Build_info']['Packages'].update({tar_file: checksum.hexdigest()})
             with open(os.path.join(output_dir, 'package.info'), 'w') as f:
                 json.dump(json_data, f, indent=4)
         except FileNotFoundError: